Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2205 insertions, 0 deletions

diff --git a/intl/icu/source/i18n/unicode/decimfmt.h b/intl/icu/source/i18n/unicode/decimfmt.h
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+++ b/intl/icu/source/i18n/unicode/decimfmt.h
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+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+********************************************************************************
+*   Copyright (C) 1997-2016, International Business Machines
+*   Corporation and others.  All Rights Reserved.
+********************************************************************************
+*
+* File DECIMFMT.H
+*
+* Modification History:
+*
+*   Date        Name        Description
+*   02/19/97    aliu        Converted from java.
+*   03/20/97    clhuang     Updated per C++ implementation.
+*   04/03/97    aliu        Rewrote parsing and formatting completely, and
+*                           cleaned up and debugged.  Actually works now.
+*   04/17/97    aliu        Changed DigitCount to int per code review.
+*   07/10/97    helena      Made ParsePosition a class and get rid of the function
+*                           hiding problems.
+*   09/09/97    aliu        Ported over support for exponential formats.
+*   07/20/98    stephen     Changed documentation
+*   01/30/13    emmons      Added Scaling methods
+********************************************************************************
+*/
+
+#ifndef DECIMFMT_H
+#define DECIMFMT_H
+
+#include "unicode/utypes.h"
+
+#if U_SHOW_CPLUSPLUS_API
+
+/**
+ * \file
+ * \brief C++ API: Compatibility APIs for decimal formatting.
+ */
+
+#if !UCONFIG_NO_FORMATTING
+
+#include "unicode/dcfmtsym.h"
+#include "unicode/numfmt.h"
+#include "unicode/locid.h"
+#include "unicode/fpositer.h"
+#include "unicode/stringpiece.h"
+#include "unicode/curramt.h"
+#include "unicode/enumset.h"
+
+U_NAMESPACE_BEGIN
+
+class CurrencyPluralInfo;
+class CompactDecimalFormat;
+
+namespace number {
+class LocalizedNumberFormatter;
+namespace impl {
+class DecimalQuantity;
+struct DecimalFormatFields;
+class UFormattedNumberData;
+}
+}
+
+namespace numparse {
+namespace impl {
+class NumberParserImpl;
+}
+}
+
+/**
+ * **IMPORTANT:** New users are strongly encouraged to see if
+ * numberformatter.h fits their use case.  Although not deprecated, this header
+ * is provided for backwards compatibility only.
+ *
+ * DecimalFormat is a concrete subclass of NumberFormat that formats decimal
+ * numbers. It has a variety of features designed to make it possible to parse
+ * and format numbers in any locale, including support for Western, Arabic, or
+ * Indic digits.  It also supports different flavors of numbers, including
+ * integers ("123"), fixed-point numbers ("123.4"), scientific notation
+ * ("1.23E4"), percentages ("12%"), and currency amounts ("$123", "USD123",
+ * "123 US dollars").  All of these flavors can be easily localized.
+ *
+ * To obtain a NumberFormat for a specific locale (including the default
+ * locale) call one of NumberFormat's factory methods such as
+ * createInstance(). Do not call the DecimalFormat constructors directly, unless
+ * you know what you are doing, since the NumberFormat factory methods may
+ * return subclasses other than DecimalFormat.
+ *
+ * **Example Usage**
+ *
+ * \code
+ *     // Normally we would have a GUI with a menu for this
+ *     int32_t locCount;
+ *     const Locale* locales = NumberFormat::getAvailableLocales(locCount);
+ *
+ *     double myNumber = -1234.56;
+ *     UErrorCode success = U_ZERO_ERROR;
+ *     NumberFormat* form;
+ *
+ *     // Print out a number with the localized number, currency and percent
+ *     // format for each locale.
+ *     UnicodeString countryName;
+ *     UnicodeString displayName;
+ *     UnicodeString str;
+ *     UnicodeString pattern;
+ *     Formattable fmtable;
+ *     for (int32_t j = 0; j < 3; ++j) {
+ *         cout << endl << "FORMAT " << j << endl;
+ *         for (int32_t i = 0; i < locCount; ++i) {
+ *             if (locales[i].getCountry(countryName).size() == 0) {
+ *                 // skip language-only
+ *                 continue;
+ *             }
+ *             switch (j) {
+ *             case 0:
+ *                 form = NumberFormat::createInstance(locales[i], success ); break;
+ *             case 1:
+ *                 form = NumberFormat::createCurrencyInstance(locales[i], success ); break;
+ *             default:
+ *                 form = NumberFormat::createPercentInstance(locales[i], success ); break;
+ *             }
+ *             if (form) {
+ *                 str.remove();
+ *                 pattern = ((DecimalFormat*)form)->toPattern(pattern);
+ *                 cout << locales[i].getDisplayName(displayName) << ": " << pattern;
+ *                 cout << "  ->  " << form->format(myNumber,str) << endl;
+ *                 form->parse(form->format(myNumber,str), fmtable, success);
+ *                 delete form;
+ *             }
+ *         }
+ *     }
+ * \endcode
+ *
+ * **Another example use createInstance(style)**
+ *
+ * \code
+ * // Print out a number using the localized number, currency,
+ * // percent, scientific, integer, iso currency, and plural currency
+ * // format for each locale</strong>
+ * Locale* locale = new Locale("en", "US");
+ * double myNumber = 1234.56;
+ * UErrorCode success = U_ZERO_ERROR;
+ * UnicodeString str;
+ * Formattable fmtable;
+ * for (int j=NumberFormat::kNumberStyle;
+ *      j<=NumberFormat::kPluralCurrencyStyle;
+ *      ++j) {
+ *     NumberFormat* form = NumberFormat::createInstance(locale, j, success);
+ *     str.remove();
+ *     cout << "format result " << form->format(myNumber, str) << endl;
+ *     format->parse(form->format(myNumber, str), fmtable, success);
+ *     delete form;
+ * }
+ * \endcode
+ *
+ *
+ * <p><strong>Patterns</strong>
+ *
+ * <p>A DecimalFormat consists of a <em>pattern</em> and a set of
+ * <em>symbols</em>.  The pattern may be set directly using
+ * applyPattern(), or indirectly using other API methods which
+ * manipulate aspects of the pattern, such as the minimum number of integer
+ * digits.  The symbols are stored in a DecimalFormatSymbols
+ * object.  When using the NumberFormat factory methods, the
+ * pattern and symbols are read from ICU's locale data.
+ *
+ * <p><strong>Special Pattern Characters</strong>
+ *
+ * <p>Many characters in a pattern are taken literally; they are matched during
+ * parsing and output unchanged during formatting.  Special characters, on the
+ * other hand, stand for other characters, strings, or classes of characters.
+ * For example, the '#' character is replaced by a localized digit.  Often the
+ * replacement character is the same as the pattern character; in the U.S. locale,
+ * the ',' grouping character is replaced by ','.  However, the replacement is
+ * still happening, and if the symbols are modified, the grouping character
+ * changes.  Some special characters affect the behavior of the formatter by
+ * their presence; for example, if the percent character is seen, then the
+ * value is multiplied by 100 before being displayed.
+ *
+ * <p>To insert a special character in a pattern as a literal, that is, without
+ * any special meaning, the character must be quoted.  There are some exceptions to
+ * this which are noted below.
+ *
+ * <p>The characters listed here are used in non-localized patterns.  Localized
+ * patterns use the corresponding characters taken from this formatter's
+ * DecimalFormatSymbols object instead, and these characters lose
+ * their special status.  Two exceptions are the currency sign and quote, which
+ * are not localized.
+ *
+ * <table border=0 cellspacing=3 cellpadding=0>
+ *   <tr bgcolor="#ccccff">
+ *     <td align=left><strong>Symbol</strong>
+ *     <td align=left><strong>Location</strong>
+ *     <td align=left><strong>Localized?</strong>
+ *     <td align=left><strong>Meaning</strong>
+ *   <tr valign=top>
+ *     <td><code>0</code>
+ *     <td>Number
+ *     <td>Yes
+ *     <td>Digit
+ *   <tr valign=top bgcolor="#eeeeff">
+ *     <td><code>1-9</code>
+ *     <td>Number
+ *     <td>Yes
+ *     <td>'1' through '9' indicate rounding.
+ *   <tr valign=top>
+ *     <td><code>\htmlonly&#x40;\endhtmlonly</code> <!--doxygen doesn't like @-->
+ *     <td>Number
+ *     <td>No
+ *     <td>Significant digit
+ *   <tr valign=top bgcolor="#eeeeff">
+ *     <td><code>#</code>
+ *     <td>Number
+ *     <td>Yes
+ *     <td>Digit, zero shows as absent
+ *   <tr valign=top>
+ *     <td><code>.</code>
+ *     <td>Number
+ *     <td>Yes
+ *     <td>Decimal separator or monetary decimal separator
+ *   <tr valign=top bgcolor="#eeeeff">
+ *     <td><code>-</code>
+ *     <td>Number
+ *     <td>Yes
+ *     <td>Minus sign
+ *   <tr valign=top>
+ *     <td><code>,</code>
+ *     <td>Number
+ *     <td>Yes
+ *     <td>Grouping separator
+ *   <tr valign=top bgcolor="#eeeeff">
+ *     <td><code>E</code>
+ *     <td>Number
+ *     <td>Yes
+ *     <td>Separates mantissa and exponent in scientific notation.
+ *         <em>Need not be quoted in prefix or suffix.</em>
+ *   <tr valign=top>
+ *     <td><code>+</code>
+ *     <td>Exponent
+ *     <td>Yes
+ *     <td>Prefix positive exponents with localized plus sign.
+ *         <em>Need not be quoted in prefix or suffix.</em>
+ *   <tr valign=top bgcolor="#eeeeff">
+ *     <td><code>;</code>
+ *     <td>Subpattern boundary
+ *     <td>Yes
+ *     <td>Separates positive and negative subpatterns
+ *   <tr valign=top>
+ *     <td><code>\%</code>
+ *     <td>Prefix or suffix
+ *     <td>Yes
+ *     <td>Multiply by 100 and show as percentage
+ *   <tr valign=top bgcolor="#eeeeff">
+ *     <td><code>\\u2030</code>
+ *     <td>Prefix or suffix
+ *     <td>Yes
+ *     <td>Multiply by 1000 and show as per mille
+ *   <tr valign=top>
+ *     <td><code>\htmlonly&curren;\endhtmlonly</code> (<code>\\u00A4</code>)
+ *     <td>Prefix or suffix
+ *     <td>No
+ *     <td>Currency sign, replaced by currency symbol.  If
+ *         doubled, replaced by international currency symbol.
+ *         If tripled, replaced by currency plural names, for example,
+ *         "US dollar" or "US dollars" for America.
+ *         If present in a pattern, the monetary decimal separator
+ *         is used instead of the decimal separator.
+ *   <tr valign=top bgcolor="#eeeeff">
+ *     <td><code>'</code>
+ *     <td>Prefix or suffix
+ *     <td>No
+ *     <td>Used to quote special characters in a prefix or suffix,
+ *         for example, <code>"'#'#"</code> formats 123 to
+ *         <code>"#123"</code>.  To create a single quote
+ *         itself, use two in a row: <code>"# o''clock"</code>.
+ *   <tr valign=top>
+ *     <td><code>*</code>
+ *     <td>Prefix or suffix boundary
+ *     <td>Yes
+ *     <td>Pad escape, precedes pad character
+ * </table>
+ *
+ * <p>A DecimalFormat pattern contains a positive and negative
+ * subpattern, for example, "#,##0.00;(#,##0.00)".  Each subpattern has a
+ * prefix, a numeric part, and a suffix.  If there is no explicit negative
+ * subpattern, the negative subpattern is the localized minus sign prefixed to the
+ * positive subpattern. That is, "0.00" alone is equivalent to "0.00;-0.00".  If there
+ * is an explicit negative subpattern, it serves only to specify the negative
+ * prefix and suffix; the number of digits, minimal digits, and other
+ * characteristics are ignored in the negative subpattern. That means that
+ * "#,##0.0#;(#)" has precisely the same result as "#,##0.0#;(#,##0.0#)".
+ *
+ * <p>The prefixes, suffixes, and various symbols used for infinity, digits,
+ * thousands separators, decimal separators, etc. may be set to arbitrary
+ * values, and they will appear properly during formatting.  However, care must
+ * be taken that the symbols and strings do not conflict, or parsing will be
+ * unreliable.  For example, either the positive and negative prefixes or the
+ * suffixes must be distinct for parse() to be able
+ * to distinguish positive from negative values.  Another example is that the
+ * decimal separator and thousands separator should be distinct characters, or
+ * parsing will be impossible.
+ *
+ * <p>The <em>grouping separator</em> is a character that separates clusters of
+ * integer digits to make large numbers more legible.  It commonly used for
+ * thousands, but in some locales it separates ten-thousands.  The <em>grouping
+ * size</em> is the number of digits between the grouping separators, such as 3
+ * for "100,000,000" or 4 for "1 0000 0000". There are actually two different
+ * grouping sizes: One used for the least significant integer digits, the
+ * <em>primary grouping size</em>, and one used for all others, the
+ * <em>secondary grouping size</em>.  In most locales these are the same, but
+ * sometimes they are different. For example, if the primary grouping interval
+ * is 3, and the secondary is 2, then this corresponds to the pattern
+ * "#,##,##0", and the number 123456789 is formatted as "12,34,56,789".  If a
+ * pattern contains multiple grouping separators, the interval between the last
+ * one and the end of the integer defines the primary grouping size, and the
+ * interval between the last two defines the secondary grouping size. All others
+ * are ignored, so "#,##,###,####" == "###,###,####" == "##,#,###,####".
+ *
+ * <p>Illegal patterns, such as "#.#.#" or "#.###,###", will cause
+ * DecimalFormat to set a failing UErrorCode.
+ *
+ * <p><strong>Pattern BNF</strong>
+ *
+ * <pre>
+ * pattern    := subpattern (';' subpattern)?
+ * subpattern := prefix? number exponent? suffix?
+ * number     := (integer ('.' fraction)?) | sigDigits
+ * prefix     := '\\u0000'..'\\uFFFD' - specialCharacters
+ * suffix     := '\\u0000'..'\\uFFFD' - specialCharacters
+ * integer    := '#'* '0'* '0'
+ * fraction   := '0'* '#'*
+ * sigDigits  := '#'* '@' '@'* '#'*
+ * exponent   := 'E' '+'? '0'* '0'
+ * padSpec    := '*' padChar
+ * padChar    := '\\u0000'..'\\uFFFD' - quote
+ * &nbsp;
+ * Notation:
+ *   X*       0 or more instances of X
+ *   X?       0 or 1 instances of X
+ *   X|Y      either X or Y
+ *   C..D     any character from C up to D, inclusive
+ *   S-T      characters in S, except those in T
+ * </pre>
+ * The first subpattern is for positive numbers. The second (optional)
+ * subpattern is for negative numbers.
+ *
+ * <p>Not indicated in the BNF syntax above:
+ *
+ * <ul><li>The grouping separator ',' can occur inside the integer and
+ * sigDigits elements, between any two pattern characters of that
+ * element, as long as the integer or sigDigits element is not
+ * followed by the exponent element.
+ *
+ * <li>Two grouping intervals are recognized: That between the
+ *     decimal point and the first grouping symbol, and that
+ *     between the first and second grouping symbols. These
+ *     intervals are identical in most locales, but in some
+ *     locales they differ. For example, the pattern
+ *     &quot;#,##,###&quot; formats the number 123456789 as
+ *     &quot;12,34,56,789&quot;.</li>
+ *
+ * <li>The pad specifier <code>padSpec</code> may appear before the prefix,
+ * after the prefix, before the suffix, after the suffix, or not at all.
+ *
+ * <li>In place of '0', the digits '1' through '9' may be used to
+ * indicate a rounding increment.
+ * </ul>
+ *
+ * <p><strong>Parsing</strong>
+ *
+ * <p>DecimalFormat parses all Unicode characters that represent
+ * decimal digits, as defined by u_charDigitValue().  In addition,
+ * DecimalFormat also recognizes as digits the ten consecutive
+ * characters starting with the localized zero digit defined in the
+ * DecimalFormatSymbols object.  During formatting, the
+ * DecimalFormatSymbols-based digits are output.
+ *
+ * <p>During parsing, grouping separators are ignored if in lenient mode;
+ * otherwise, if present, they must be in appropriate positions.
+ *
+ * <p>For currency parsing, the formatter is able to parse every currency
+ * style formats no matter which style the formatter is constructed with.
+ * For example, a formatter instance gotten from
+ * NumberFormat.getInstance(ULocale, NumberFormat.CURRENCYSTYLE) can parse
+ * formats such as "USD1.00" and "3.00 US dollars".
+ *
+ * <p>If parse(UnicodeString&,Formattable&,ParsePosition&)
+ * fails to parse a string, it leaves the parse position unchanged.
+ * The convenience method parse(UnicodeString&,Formattable&,UErrorCode&)
+ * indicates parse failure by setting a failing
+ * UErrorCode.
+ *
+ * <p><strong>Formatting</strong>
+ *
+ * <p>Formatting is guided by several parameters, all of which can be
+ * specified either using a pattern or using the API.  The following
+ * description applies to formats that do not use <a href="#sci">scientific
+ * notation</a> or <a href="#sigdig">significant digits</a>.
+ *
+ * <ul><li>If the number of actual integer digits exceeds the
+ * <em>maximum integer digits</em>, then only the least significant
+ * digits are shown.  For example, 1997 is formatted as "97" if the
+ * maximum integer digits is set to 2.
+ *
+ * <li>If the number of actual integer digits is less than the
+ * <em>minimum integer digits</em>, then leading zeros are added.  For
+ * example, 1997 is formatted as "01997" if the minimum integer digits
+ * is set to 5.
+ *
+ * <li>If the number of actual fraction digits exceeds the <em>maximum
+ * fraction digits</em>, then rounding is performed to the
+ * maximum fraction digits.  For example, 0.125 is formatted as "0.12"
+ * if the maximum fraction digits is 2.  This behavior can be changed
+ * by specifying a rounding increment and/or a rounding mode.
+ *
+ * <li>If the number of actual fraction digits is less than the
+ * <em>minimum fraction digits</em>, then trailing zeros are added.
+ * For example, 0.125 is formatted as "0.1250" if the minimum fraction
+ * digits is set to 4.
+ *
+ * <li>Trailing fractional zeros are not displayed if they occur
+ * <em>j</em> positions after the decimal, where <em>j</em> is less
+ * than the maximum fraction digits. For example, 0.10004 is
+ * formatted as "0.1" if the maximum fraction digits is four or less.
+ * </ul>
+ *
+ * <p><strong>Special Values</strong>
+ *
+ * <p><code>NaN</code> is represented as a single character, typically
+ * <code>\\uFFFD</code>.  This character is determined by the
+ * DecimalFormatSymbols object.  This is the only value for which
+ * the prefixes and suffixes are not used.
+ *
+ * <p>Infinity is represented as a single character, typically
+ * <code>\\u221E</code>, with the positive or negative prefixes and suffixes
+ * applied.  The infinity character is determined by the
+ * DecimalFormatSymbols object.
+ *
+ * <a name="sci"><strong>Scientific Notation</strong></a>
+ *
+ * <p>Numbers in scientific notation are expressed as the product of a mantissa
+ * and a power of ten, for example, 1234 can be expressed as 1.234 x 10<sup>3</sup>. The
+ * mantissa is typically in the half-open interval [1.0, 10.0) or sometimes [0.0, 1.0),
+ * but it need not be.  DecimalFormat supports arbitrary mantissas.
+ * DecimalFormat can be instructed to use scientific
+ * notation through the API or through the pattern.  In a pattern, the exponent
+ * character immediately followed by one or more digit characters indicates
+ * scientific notation.  Example: "0.###E0" formats the number 1234 as
+ * "1.234E3".
+ *
+ * <ul>
+ * <li>The number of digit characters after the exponent character gives the
+ * minimum exponent digit count.  There is no maximum.  Negative exponents are
+ * formatted using the localized minus sign, <em>not</em> the prefix and suffix
+ * from the pattern.  This allows patterns such as "0.###E0 m/s".  To prefix
+ * positive exponents with a localized plus sign, specify '+' between the
+ * exponent and the digits: "0.###E+0" will produce formats "1E+1", "1E+0",
+ * "1E-1", etc.  (In localized patterns, use the localized plus sign rather than
+ * '+'.)
+ *
+ * <li>The minimum number of integer digits is achieved by adjusting the
+ * exponent.  Example: 0.00123 formatted with "00.###E0" yields "12.3E-4".  This
+ * only happens if there is no maximum number of integer digits.  If there is a
+ * maximum, then the minimum number of integer digits is fixed at one.
+ *
+ * <li>The maximum number of integer digits, if present, specifies the exponent
+ * grouping.  The most common use of this is to generate <em>engineering
+ * notation</em>, in which the exponent is a multiple of three, e.g.,
+ * "##0.###E0".  The number 12345 is formatted using "##0.####E0" as "12.345E3".
+ *
+ * <li>When using scientific notation, the formatter controls the
+ * digit counts using significant digits logic.  The maximum number of
+ * significant digits limits the total number of integer and fraction
+ * digits that will be shown in the mantissa; it does not affect
+ * parsing.  For example, 12345 formatted with "##0.##E0" is "12.3E3".
+ * See the section on significant digits for more details.
+ *
+ * <li>The number of significant digits shown is determined as
+ * follows: If areSignificantDigitsUsed() returns false, then the
+ * minimum number of significant digits shown is one, and the maximum
+ * number of significant digits shown is the sum of the <em>minimum
+ * integer</em> and <em>maximum fraction</em> digits, and is
+ * unaffected by the maximum integer digits.  If this sum is zero,
+ * then all significant digits are shown.  If
+ * areSignificantDigitsUsed() returns true, then the significant digit
+ * counts are specified by getMinimumSignificantDigits() and
+ * getMaximumSignificantDigits().  In this case, the number of
+ * integer digits is fixed at one, and there is no exponent grouping.
+ *
+ * <li>Exponential patterns may not contain grouping separators.
+ * </ul>
+ *
+ * <a name="sigdig"><strong>Significant Digits</strong></a>
+ *
+ * <code>DecimalFormat</code> has two ways of controlling how many
+ * digits are shows: (a) significant digits counts, or (b) integer and
+ * fraction digit counts.  Integer and fraction digit counts are
+ * described above.  When a formatter is using significant digits
+ * counts, the number of integer and fraction digits is not specified
+ * directly, and the formatter settings for these counts are ignored.
+ * Instead, the formatter uses however many integer and fraction
+ * digits are required to display the specified number of significant
+ * digits.  Examples:
+ *
+ * <table border=0 cellspacing=3 cellpadding=0>
+ *   <tr bgcolor="#ccccff">
+ *     <td align=left>Pattern
+ *     <td align=left>Minimum significant digits
+ *     <td align=left>Maximum significant digits
+ *     <td align=left>Number
+ *     <td align=left>Output of format()
+ *   <tr valign=top>
+ *     <td><code>\@\@\@</code>
+ *     <td>3
+ *     <td>3
+ *     <td>12345
+ *     <td><code>12300</code>
+ *   <tr valign=top bgcolor="#eeeeff">
+ *     <td><code>\@\@\@</code>
+ *     <td>3
+ *     <td>3
+ *     <td>0.12345
+ *     <td><code>0.123</code>
+ *   <tr valign=top>
+ *     <td><code>\@\@##</code>
+ *     <td>2
+ *     <td>4
+ *     <td>3.14159
+ *     <td><code>3.142</code>
+ *   <tr valign=top bgcolor="#eeeeff">
+ *     <td><code>\@\@##</code>
+ *     <td>2
+ *     <td>4
+ *     <td>1.23004
+ *     <td><code>1.23</code>
+ * </table>
+ *
+ * <ul>
+ * <li>Significant digit counts may be expressed using patterns that
+ * specify a minimum and maximum number of significant digits.  These
+ * are indicated by the <code>'@'</code> and <code>'#'</code>
+ * characters.  The minimum number of significant digits is the number
+ * of <code>'@'</code> characters.  The maximum number of significant
+ * digits is the number of <code>'@'</code> characters plus the number
+ * of <code>'#'</code> characters following on the right.  For
+ * example, the pattern <code>"@@@"</code> indicates exactly 3
+ * significant digits.  The pattern <code>"@##"</code> indicates from
+ * 1 to 3 significant digits.  Trailing zero digits to the right of
+ * the decimal separator are suppressed after the minimum number of
+ * significant digits have been shown.  For example, the pattern
+ * <code>"@##"</code> formats the number 0.1203 as
+ * <code>"0.12"</code>.
+ *
+ * <li>If a pattern uses significant digits, it may not contain a
+ * decimal separator, nor the <code>'0'</code> pattern character.
+ * Patterns such as <code>"@00"</code> or <code>"@.###"</code> are
+ * disallowed.
+ *
+ * <li>Any number of <code>'#'</code> characters may be prepended to
+ * the left of the leftmost <code>'@'</code> character.  These have no
+ * effect on the minimum and maximum significant digits counts, but
+ * may be used to position grouping separators.  For example,
+ * <code>"#,#@#"</code> indicates a minimum of one significant digits,
+ * a maximum of two significant digits, and a grouping size of three.
+ *
+ * <li>In order to enable significant digits formatting, use a pattern
+ * containing the <code>'@'</code> pattern character.  Alternatively,
+ * call setSignificantDigitsUsed(TRUE).
+ *
+ * <li>In order to disable significant digits formatting, use a
+ * pattern that does not contain the <code>'@'</code> pattern
+ * character. Alternatively, call setSignificantDigitsUsed(FALSE).
+ *
+ * <li>The number of significant digits has no effect on parsing.
+ *
+ * <li>Significant digits may be used together with exponential notation. Such
+ * patterns are equivalent to a normal exponential pattern with a minimum and
+ * maximum integer digit count of one, a minimum fraction digit count of
+ * <code>getMinimumSignificantDigits() - 1</code>, and a maximum fraction digit
+ * count of <code>getMaximumSignificantDigits() - 1</code>. For example, the
+ * pattern <code>"@@###E0"</code> is equivalent to <code>"0.0###E0"</code>.
+ *
+ * <li>If significant digits are in use, then the integer and fraction
+ * digit counts, as set via the API, are ignored.  If significant
+ * digits are not in use, then the significant digit counts, as set via
+ * the API, are ignored.
+ *
+ * </ul>
+ *
+ * <p><strong>Padding</strong>
+ *
+ * <p>DecimalFormat supports padding the result of
+ * format() to a specific width.  Padding may be specified either
+ * through the API or through the pattern syntax.  In a pattern the pad escape
+ * character, followed by a single pad character, causes padding to be parsed
+ * and formatted.  The pad escape character is '*' in unlocalized patterns, and
+ * can be localized using DecimalFormatSymbols::setSymbol() with a
+ * DecimalFormatSymbols::kPadEscapeSymbol
+ * selector.  For example, <code>"$*x#,##0.00"</code> formats 123 to
+ * <code>"$xx123.00"</code>, and 1234 to <code>"$1,234.00"</code>.
+ *
+ * <ul>
+ * <li>When padding is in effect, the width of the positive subpattern,
+ * including prefix and suffix, determines the format width.  For example, in
+ * the pattern <code>"* #0 o''clock"</code>, the format width is 10.
+ *
+ * <li>The width is counted in 16-bit code units (char16_ts).
+ *
+ * <li>Some parameters which usually do not matter have meaning when padding is
+ * used, because the pattern width is significant with padding.  In the pattern
+ * "* ##,##,#,##0.##", the format width is 14.  The initial characters "##,##,"
+ * do not affect the grouping size or maximum integer digits, but they do affect
+ * the format width.
+ *
+ * <li>Padding may be inserted at one of four locations: before the prefix,
+ * after the prefix, before the suffix, or after the suffix.  If padding is
+ * specified in any other location, applyPattern()
+ * sets a failing UErrorCode.  If there is no prefix,
+ * before the prefix and after the prefix are equivalent, likewise for the
+ * suffix.
+ *
+ * <li>When specified in a pattern, the 32-bit code point immediately
+ * following the pad escape is the pad character. This may be any character,
+ * including a special pattern character. That is, the pad escape
+ * <em>escapes</em> the following character. If there is no character after
+ * the pad escape, then the pattern is illegal.
+ *
+ * </ul>
+ *
+ * <p><strong>Rounding</strong>
+ *
+ * <p>DecimalFormat supports rounding to a specific increment.  For
+ * example, 1230 rounded to the nearest 50 is 1250.  1.234 rounded to the
+ * nearest 0.65 is 1.3.  The rounding increment may be specified through the API
+ * or in a pattern.  To specify a rounding increment in a pattern, include the
+ * increment in the pattern itself.  "#,#50" specifies a rounding increment of
+ * 50.  "#,##0.05" specifies a rounding increment of 0.05.
+ *
+ * <p>In the absence of an explicit rounding increment numbers are
+ * rounded to their formatted width.
+ *
+ * <ul>
+ * <li>Rounding only affects the string produced by formatting.  It does
+ * not affect parsing or change any numerical values.
+ *
+ * <li>A <em>rounding mode</em> determines how values are rounded; see
+ * DecimalFormat::ERoundingMode.  The default rounding mode is
+ * DecimalFormat::kRoundHalfEven.  The rounding mode can only be set
+ * through the API; it can not be set with a pattern.
+ *
+ * <li>Some locales use rounding in their currency formats to reflect the
+ * smallest currency denomination.
+ *
+ * <li>In a pattern, digits '1' through '9' specify rounding, but otherwise
+ * behave identically to digit '0'.
+ * </ul>
+ *
+ * <p><strong>Synchronization</strong>
+ *
+ * <p>DecimalFormat objects are not synchronized.  Multiple
+ * threads should not access one formatter concurrently.
+ *
+ * <p><strong>Subclassing</strong>
+ *
+ * <p><em>User subclasses are not supported.</em> While clients may write
+ * subclasses, such code will not necessarily work and will not be
+ * guaranteed to work stably from release to release.
+ */
+class U_I18N_API DecimalFormat : public NumberFormat {
+  public:
+    /**
+     * Pad position.
+     * @stable ICU 2.4
+     */
+    enum EPadPosition {
+        kPadBeforePrefix, kPadAfterPrefix, kPadBeforeSuffix, kPadAfterSuffix
+    };
+
+    /**
+     * Create a DecimalFormat using the default pattern and symbols
+     * for the default locale. This is a convenient way to obtain a
+     * DecimalFormat when internationalization is not the main concern.
+     * <P>
+     * To obtain standard formats for a given locale, use the factory methods
+     * on NumberFormat such as createInstance. These factories will
+     * return the most appropriate sub-class of NumberFormat for a given
+     * locale.
+     * <p>
+     * <strong>NOTE:</strong> New users are strongly encouraged to use
+     * #icu::number::NumberFormatter instead of DecimalFormat.
+     * @param status    Output param set to success/failure code. If the
+     *                  pattern is invalid this will be set to a failure code.
+     * @stable ICU 2.0
+     */
+    DecimalFormat(UErrorCode& status);
+
+    /**
+     * Create a DecimalFormat from the given pattern and the symbols
+     * for the default locale. This is a convenient way to obtain a
+     * DecimalFormat when internationalization is not the main concern.
+     * <P>
+     * To obtain standard formats for a given locale, use the factory methods
+     * on NumberFormat such as createInstance. These factories will
+     * return the most appropriate sub-class of NumberFormat for a given
+     * locale.
+     * <p>
+     * <strong>NOTE:</strong> New users are strongly encouraged to use
+     * #icu::number::NumberFormatter instead of DecimalFormat.
+     * @param pattern   A non-localized pattern string.
+     * @param status    Output param set to success/failure code. If the
+     *                  pattern is invalid this will be set to a failure code.
+     * @stable ICU 2.0
+     */
+    DecimalFormat(const UnicodeString& pattern, UErrorCode& status);
+
+    /**
+     * Create a DecimalFormat from the given pattern and symbols.
+     * Use this constructor when you need to completely customize the
+     * behavior of the format.
+     * <P>
+     * To obtain standard formats for a given
+     * locale, use the factory methods on NumberFormat such as
+     * createInstance or createCurrencyInstance. If you need only minor adjustments
+     * to a standard format, you can modify the format returned by
+     * a NumberFormat factory method.
+     * <p>
+     * <strong>NOTE:</strong> New users are strongly encouraged to use
+     * #icu::number::NumberFormatter instead of DecimalFormat.
+     *
+     * @param pattern           a non-localized pattern string
+     * @param symbolsToAdopt    the set of symbols to be used.  The caller should not
+     *                          delete this object after making this call.
+     * @param status            Output param set to success/failure code. If the
+     *                          pattern is invalid this will be set to a failure code.
+     * @stable ICU 2.0
+     */
+    DecimalFormat(const UnicodeString& pattern, DecimalFormatSymbols* symbolsToAdopt, UErrorCode& status);
+
+#ifndef U_HIDE_INTERNAL_API
+
+    /**
+     * This API is for ICU use only.
+     * Create a DecimalFormat from the given pattern, symbols, and style.
+     *
+     * @param pattern           a non-localized pattern string
+     * @param symbolsToAdopt    the set of symbols to be used.  The caller should not
+     *                          delete this object after making this call.
+     * @param style             style of decimal format
+     * @param status            Output param set to success/failure code. If the
+     *                          pattern is invalid this will be set to a failure code.
+     * @internal
+     */
+    DecimalFormat(const UnicodeString& pattern, DecimalFormatSymbols* symbolsToAdopt,
+                  UNumberFormatStyle style, UErrorCode& status);
+
+#if UCONFIG_HAVE_PARSEALLINPUT
+
+    /**
+     * @internal
+     */
+    void setParseAllInput(UNumberFormatAttributeValue value);
+
+#endif
+
+#endif  /* U_HIDE_INTERNAL_API */
+
+  private:
+
+    /**
+     * Internal constructor for DecimalFormat; sets up internal fields. All public constructors should
+     * call this constructor.
+     */
+    DecimalFormat(const DecimalFormatSymbols* symbolsToAdopt, UErrorCode& status);
+
+  public:
+
+    /**
+     * Set an integer attribute on this DecimalFormat.
+     * May return U_UNSUPPORTED_ERROR if this instance does not support
+     * the specified attribute.
+     * @param attr the attribute to set
+     * @param newValue new value
+     * @param status the error type
+     * @return *this - for chaining (example: format.setAttribute(...).setAttribute(...) )
+     * @stable ICU 51
+     */
+    virtual DecimalFormat& setAttribute(UNumberFormatAttribute attr, int32_t newValue, UErrorCode& status);
+
+    /**
+     * Get an integer
+     * May return U_UNSUPPORTED_ERROR if this instance does not support
+     * the specified attribute.
+     * @param attr the attribute to set
+     * @param status the error type
+     * @return the attribute value. Undefined if there is an error.
+     * @stable ICU 51
+     */
+    virtual int32_t getAttribute(UNumberFormatAttribute attr, UErrorCode& status) const;
+
+
+    /**
+     * Set whether or not grouping will be used in this format.
+     * @param newValue    True, grouping will be used in this format.
+     * @see getGroupingUsed
+     * @stable ICU 53
+     */
+    void setGroupingUsed(UBool newValue) U_OVERRIDE;
+
+    /**
+     * Sets whether or not numbers should be parsed as integers only.
+     * @param value    set True, this format will parse numbers as integers
+     *                 only.
+     * @see isParseIntegerOnly
+     * @stable ICU 53
+     */
+    void setParseIntegerOnly(UBool value) U_OVERRIDE;
+
+    /**
+     * Sets whether lenient parsing should be enabled (it is off by default).
+     *
+     * @param enable \c TRUE if lenient parsing should be used,
+     *               \c FALSE otherwise.
+     * @stable ICU 4.8
+     */
+    void setLenient(UBool enable) U_OVERRIDE;
+
+    /**
+     * Create a DecimalFormat from the given pattern and symbols.
+     * Use this constructor when you need to completely customize the
+     * behavior of the format.
+     * <P>
+     * To obtain standard formats for a given
+     * locale, use the factory methods on NumberFormat such as
+     * createInstance or createCurrencyInstance. If you need only minor adjustments
+     * to a standard format, you can modify the format returned by
+     * a NumberFormat factory method.
+     * <p>
+     * <strong>NOTE:</strong> New users are strongly encouraged to use
+     * #icu::number::NumberFormatter instead of DecimalFormat.
+     *
+     * @param pattern           a non-localized pattern string
+     * @param symbolsToAdopt    the set of symbols to be used.  The caller should not
+     *                          delete this object after making this call.
+     * @param parseError        Output param to receive errors occurred during parsing
+     * @param status            Output param set to success/failure code. If the
+     *                          pattern is invalid this will be set to a failure code.
+     * @stable ICU 2.0
+     */
+    DecimalFormat(const UnicodeString& pattern, DecimalFormatSymbols* symbolsToAdopt,
+                  UParseError& parseError, UErrorCode& status);
+
+    /**
+     * Create a DecimalFormat from the given pattern and symbols.
+     * Use this constructor when you need to completely customize the
+     * behavior of the format.
+     * <P>
+     * To obtain standard formats for a given
+     * locale, use the factory methods on NumberFormat such as
+     * createInstance or createCurrencyInstance. If you need only minor adjustments
+     * to a standard format, you can modify the format returned by
+     * a NumberFormat factory method.
+     * <p>
+     * <strong>NOTE:</strong> New users are strongly encouraged to use
+     * #icu::number::NumberFormatter instead of DecimalFormat.
+     *
+     * @param pattern           a non-localized pattern string
+     * @param symbols   the set of symbols to be used
+     * @param status            Output param set to success/failure code. If the
+     *                          pattern is invalid this will be set to a failure code.
+     * @stable ICU 2.0
+     */
+    DecimalFormat(const UnicodeString& pattern, const DecimalFormatSymbols& symbols, UErrorCode& status);
+
+    /**
+     * Copy constructor.
+     *
+     * @param source    the DecimalFormat object to be copied from.
+     * @stable ICU 2.0
+     */
+    DecimalFormat(const DecimalFormat& source);
+
+    /**
+     * Assignment operator.
+     *
+     * @param rhs    the DecimalFormat object to be copied.
+     * @stable ICU 2.0
+     */
+    DecimalFormat& operator=(const DecimalFormat& rhs);
+
+    /**
+     * Destructor.
+     * @stable ICU 2.0
+     */
+    ~DecimalFormat() U_OVERRIDE;
+
+    /**
+     * Clone this Format object polymorphically. The caller owns the
+     * result and should delete it when done.
+     *
+     * @return    a polymorphic copy of this DecimalFormat.
+     * @stable ICU 2.0
+     */
+    DecimalFormat* clone() const U_OVERRIDE;
+
+    /**
+     * Return true if the given Format objects are semantically equal.
+     * Objects of different subclasses are considered unequal.
+     *
+     * @param other    the object to be compared with.
+     * @return         true if the given Format objects are semantically equal.
+     * @stable ICU 2.0
+     */
+    UBool operator==(const Format& other) const U_OVERRIDE;
+
+
+    using NumberFormat::format;
+
+    /**
+     * Format a double or long number using base-10 representation.
+     *
+     * @param number    The value to be formatted.
+     * @param appendTo  Output parameter to receive result.
+     *                  Result is appended to existing contents.
+     * @param pos       On input: an alignment field, if desired.
+     *                  On output: the offsets of the alignment field.
+     * @return          Reference to 'appendTo' parameter.
+     * @stable ICU 2.0
+     */
+    UnicodeString& format(double number, UnicodeString& appendTo, FieldPosition& pos) const U_OVERRIDE;
+
+#ifndef U_HIDE_INTERNAL_API
+    /**
+     * Format a double or long number using base-10 representation.
+     *
+     * @param number    The value to be formatted.
+     * @param appendTo  Output parameter to receive result.
+     *                  Result is appended to existing contents.
+     * @param pos       On input: an alignment field, if desired.
+     *                  On output: the offsets of the alignment field.
+     * @param status
+     * @return          Reference to 'appendTo' parameter.
+     * @internal
+     */
+    UnicodeString& format(double number, UnicodeString& appendTo, FieldPosition& pos,
+                          UErrorCode& status) const U_OVERRIDE;
+#endif  /* U_HIDE_INTERNAL_API */
+
+    /**
+     * Format a double or long number using base-10 representation.
+     *
+     * @param number    The value to be formatted.
+     * @param appendTo  Output parameter to receive result.
+     *                  Result is appended to existing contents.
+     * @param posIter   On return, can be used to iterate over positions
+     *                  of fields generated by this format call.
+     *                  Can be NULL.
+     * @param status    Output param filled with success/failure status.
+     * @return          Reference to 'appendTo' parameter.
+     * @stable ICU 4.4
+     */
+    UnicodeString& format(double number, UnicodeString& appendTo, FieldPositionIterator* posIter,
+                          UErrorCode& status) const U_OVERRIDE;
+
+    /**
+     * Format a long number using base-10 representation.
+     *
+     * @param number    The value to be formatted.
+     * @param appendTo  Output parameter to receive result.
+     *                  Result is appended to existing contents.
+     * @param pos       On input: an alignment field, if desired.
+     *                  On output: the offsets of the alignment field.
+     * @return          Reference to 'appendTo' parameter.
+     * @stable ICU 2.0
+     */
+    UnicodeString& format(int32_t number, UnicodeString& appendTo, FieldPosition& pos) const U_OVERRIDE;
+
+#ifndef U_HIDE_INTERNAL_API
+    /**
+     * Format a long number using base-10 representation.
+     *
+     * @param number    The value to be formatted.
+     * @param appendTo  Output parameter to receive result.
+     *                  Result is appended to existing contents.
+     * @param pos       On input: an alignment field, if desired.
+     *                  On output: the offsets of the alignment field.
+     * @param status    Output param filled with success/failure status.
+     * @return          Reference to 'appendTo' parameter.
+     * @internal
+     */
+    UnicodeString& format(int32_t number, UnicodeString& appendTo, FieldPosition& pos,
+                          UErrorCode& status) const U_OVERRIDE;
+#endif  /* U_HIDE_INTERNAL_API */
+
+    /**
+     * Format a long number using base-10 representation.
+     *
+     * @param number    The value to be formatted.
+     * @param appendTo  Output parameter to receive result.
+     *                  Result is appended to existing contents.
+     * @param posIter   On return, can be used to iterate over positions
+     *                  of fields generated by this format call.
+     *                  Can be NULL.
+     * @param status    Output param filled with success/failure status.
+     * @return          Reference to 'appendTo' parameter.
+     * @stable ICU 4.4
+     */
+    UnicodeString& format(int32_t number, UnicodeString& appendTo, FieldPositionIterator* posIter,
+                          UErrorCode& status) const U_OVERRIDE;
+
+    /**
+     * Format an int64 number using base-10 representation.
+     *
+     * @param number    The value to be formatted.
+     * @param appendTo  Output parameter to receive result.
+     *                  Result is appended to existing contents.
+     * @param pos       On input: an alignment field, if desired.
+     *                  On output: the offsets of the alignment field.
+     * @return          Reference to 'appendTo' parameter.
+     * @stable ICU 2.8
+     */
+    UnicodeString& format(int64_t number, UnicodeString& appendTo, FieldPosition& pos) const U_OVERRIDE;
+
+#ifndef U_HIDE_INTERNAL_API
+    /**
+     * Format an int64 number using base-10 representation.
+     *
+     * @param number    The value to be formatted.
+     * @param appendTo  Output parameter to receive result.
+     *                  Result is appended to existing contents.
+     * @param pos       On input: an alignment field, if desired.
+     *                  On output: the offsets of the alignment field.
+     * @param status    Output param filled with success/failure status.
+     * @return          Reference to 'appendTo' parameter.
+     * @internal
+     */
+    UnicodeString& format(int64_t number, UnicodeString& appendTo, FieldPosition& pos,
+                          UErrorCode& status) const U_OVERRIDE;
+#endif  /* U_HIDE_INTERNAL_API */
+
+    /**
+     * Format an int64 number using base-10 representation.
+     *
+     * @param number    The value to be formatted.
+     * @param appendTo  Output parameter to receive result.
+     *                  Result is appended to existing contents.
+     * @param posIter   On return, can be used to iterate over positions
+     *                  of fields generated by this format call.
+     *                  Can be NULL.
+     * @param status    Output param filled with success/failure status.
+     * @return          Reference to 'appendTo' parameter.
+     * @stable ICU 4.4
+     */
+    UnicodeString& format(int64_t number, UnicodeString& appendTo, FieldPositionIterator* posIter,
+                          UErrorCode& status) const U_OVERRIDE;
+
+    /**
+     * Format a decimal number.
+     * The syntax of the unformatted number is a "numeric string"
+     * as defined in the Decimal Arithmetic Specification, available at
+     * http://speleotrove.com/decimal
+     *
+     * @param number    The unformatted number, as a string.
+     * @param appendTo  Output parameter to receive result.
+     *                  Result is appended to existing contents.
+     * @param posIter   On return, can be used to iterate over positions
+     *                  of fields generated by this format call.
+     *                  Can be NULL.
+     * @param status    Output param filled with success/failure status.
+     * @return          Reference to 'appendTo' parameter.
+     * @stable ICU 4.4
+     */
+    UnicodeString& format(StringPiece number, UnicodeString& appendTo, FieldPositionIterator* posIter,
+                          UErrorCode& status) const U_OVERRIDE;
+
+#ifndef U_HIDE_INTERNAL_API
+
+    /**
+     * Format a decimal number.
+     * The number is a DecimalQuantity wrapper onto a floating point decimal number.
+     * The default implementation in NumberFormat converts the decimal number
+     * to a double and formats that.
+     *
+     * @param number    The number, a DecimalQuantity format Decimal Floating Point.
+     * @param appendTo  Output parameter to receive result.
+     *                  Result is appended to existing contents.
+     * @param posIter   On return, can be used to iterate over positions
+     *                  of fields generated by this format call.
+     * @param status    Output param filled with success/failure status.
+     * @return          Reference to 'appendTo' parameter.
+     * @internal
+     */
+    UnicodeString& format(const number::impl::DecimalQuantity& number, UnicodeString& appendTo,
+                          FieldPositionIterator* posIter, UErrorCode& status) const U_OVERRIDE;
+
+    /**
+     * Format a decimal number.
+     * The number is a DecimalQuantity wrapper onto a floating point decimal number.
+     * The default implementation in NumberFormat converts the decimal number
+     * to a double and formats that.
+     *
+     * @param number    The number, a DecimalQuantity format Decimal Floating Point.
+     * @param appendTo  Output parameter to receive result.
+     *                  Result is appended to existing contents.
+     * @param pos       On input: an alignment field, if desired.
+     *                  On output: the offsets of the alignment field.
+     * @param status    Output param filled with success/failure status.
+     * @return          Reference to 'appendTo' parameter.
+     * @internal
+     */
+    UnicodeString& format(const number::impl::DecimalQuantity& number, UnicodeString& appendTo,
+                          FieldPosition& pos, UErrorCode& status) const U_OVERRIDE;
+
+#endif // U_HIDE_INTERNAL_API
+
+    using NumberFormat::parse;
+
+    /**
+     * Parse the given string using this object's choices. The method
+     * does string comparisons to try to find an optimal match.
+     * If no object can be parsed, index is unchanged, and NULL is
+     * returned.  The result is returned as the most parsimonious
+     * type of Formattable that will accommodate all of the
+     * necessary precision.  For example, if the result is exactly 12,
+     * it will be returned as a long.  However, if it is 1.5, it will
+     * be returned as a double.
+     *
+     * @param text           The text to be parsed.
+     * @param result         Formattable to be set to the parse result.
+     *                       If parse fails, return contents are undefined.
+     * @param parsePosition  The position to start parsing at on input.
+     *                       On output, moved to after the last successfully
+     *                       parse character. On parse failure, does not change.
+     * @see Formattable
+     * @stable ICU 2.0
+     */
+    void parse(const UnicodeString& text, Formattable& result,
+               ParsePosition& parsePosition) const U_OVERRIDE;
+
+    /**
+     * Parses text from the given string as a currency amount.  Unlike
+     * the parse() method, this method will attempt to parse a generic
+     * currency name, searching for a match of this object's locale's
+     * currency display names, or for a 3-letter ISO currency code.
+     * This method will fail if this format is not a currency format,
+     * that is, if it does not contain the currency pattern symbol
+     * (U+00A4) in its prefix or suffix.
+     *
+     * @param text the string to parse
+     * @param pos  input-output position; on input, the position within text
+     *             to match; must have 0 <= pos.getIndex() < text.length();
+     *             on output, the position after the last matched character.
+     *             If the parse fails, the position in unchanged upon output.
+     * @return     if parse succeeds, a pointer to a newly-created CurrencyAmount
+     *             object (owned by the caller) containing information about
+     *             the parsed currency; if parse fails, this is NULL.
+     * @stable ICU 49
+     */
+    CurrencyAmount* parseCurrency(const UnicodeString& text, ParsePosition& pos) const U_OVERRIDE;
+
+    /**
+     * Returns the decimal format symbols, which is generally not changed
+     * by the programmer or user.
+     * @return desired DecimalFormatSymbols
+     * @see DecimalFormatSymbols
+     * @stable ICU 2.0
+     */
+    virtual const DecimalFormatSymbols* getDecimalFormatSymbols(void) const;
+
+    /**
+     * Sets the decimal format symbols, which is generally not changed
+     * by the programmer or user.
+     * @param symbolsToAdopt DecimalFormatSymbols to be adopted.
+     * @stable ICU 2.0
+     */
+    virtual void adoptDecimalFormatSymbols(DecimalFormatSymbols* symbolsToAdopt);
+
+    /**
+     * Sets the decimal format symbols, which is generally not changed
+     * by the programmer or user.
+     * @param symbols DecimalFormatSymbols.
+     * @stable ICU 2.0
+     */
+    virtual void setDecimalFormatSymbols(const DecimalFormatSymbols& symbols);
+
+
+    /**
+     * Returns the currency plural format information,
+     * which is generally not changed by the programmer or user.
+     * @return desired CurrencyPluralInfo
+     * @stable ICU 4.2
+     */
+    virtual const CurrencyPluralInfo* getCurrencyPluralInfo(void) const;
+
+    /**
+     * Sets the currency plural format information,
+     * which is generally not changed by the programmer or user.
+     * @param toAdopt CurrencyPluralInfo to be adopted.
+     * @stable ICU 4.2
+     */
+    virtual void adoptCurrencyPluralInfo(CurrencyPluralInfo* toAdopt);
+
+    /**
+     * Sets the currency plural format information,
+     * which is generally not changed by the programmer or user.
+     * @param info Currency Plural Info.
+     * @stable ICU 4.2
+     */
+    virtual void setCurrencyPluralInfo(const CurrencyPluralInfo& info);
+
+
+    /**
+     * Get the positive prefix.
+     *
+     * @param result    Output param which will receive the positive prefix.
+     * @return          A reference to 'result'.
+     * Examples: +123, $123, sFr123
+     * @stable ICU 2.0
+     */
+    UnicodeString& getPositivePrefix(UnicodeString& result) const;
+
+    /**
+     * Set the positive prefix.
+     *
+     * @param newValue    the new value of the the positive prefix to be set.
+     * Examples: +123, $123, sFr123
+     * @stable ICU 2.0
+     */
+    virtual void setPositivePrefix(const UnicodeString& newValue);
+
+    /**
+     * Get the negative prefix.
+     *
+     * @param result    Output param which will receive the negative prefix.
+     * @return          A reference to 'result'.
+     * Examples: -123, ($123) (with negative suffix), sFr-123
+     * @stable ICU 2.0
+     */
+    UnicodeString& getNegativePrefix(UnicodeString& result) const;
+
+    /**
+     * Set the negative prefix.
+     *
+     * @param newValue    the new value of the the negative prefix to be set.
+     * Examples: -123, ($123) (with negative suffix), sFr-123
+     * @stable ICU 2.0
+     */
+    virtual void setNegativePrefix(const UnicodeString& newValue);
+
+    /**
+     * Get the positive suffix.
+     *
+     * @param result    Output param which will receive the positive suffix.
+     * @return          A reference to 'result'.
+     * Example: 123%
+     * @stable ICU 2.0
+     */
+    UnicodeString& getPositiveSuffix(UnicodeString& result) const;
+
+    /**
+     * Set the positive suffix.
+     *
+     * @param newValue    the new value of the positive suffix to be set.
+     * Example: 123%
+     * @stable ICU 2.0
+     */
+    virtual void setPositiveSuffix(const UnicodeString& newValue);
+
+    /**
+     * Get the negative suffix.
+     *
+     * @param result    Output param which will receive the negative suffix.
+     * @return          A reference to 'result'.
+     * Examples: -123%, ($123) (with positive suffixes)
+     * @stable ICU 2.0
+     */
+    UnicodeString& getNegativeSuffix(UnicodeString& result) const;
+
+    /**
+     * Set the negative suffix.
+     *
+     * @param newValue    the new value of the negative suffix to be set.
+     * Examples: 123%
+     * @stable ICU 2.0
+     */
+    virtual void setNegativeSuffix(const UnicodeString& newValue);
+
+    /**
+     * Whether to show the plus sign on positive (non-negative) numbers; for example, "+12"
+     *
+     * For more control over sign display, use NumberFormatter.
+     *
+     * @return Whether the sign is shown on positive numbers and zero.
+     * @stable ICU 64
+     */
+    UBool isSignAlwaysShown() const;
+
+    /**
+     * Set whether to show the plus sign on positive (non-negative) numbers; for example, "+12".
+     *
+     * For more control over sign display, use NumberFormatter.
+     *
+     * @param value true to always show a sign; false to hide the sign on positive numbers and zero.
+     * @stable ICU 64
+     */
+    void setSignAlwaysShown(UBool value);
+
+    /**
+     * Get the multiplier for use in percent, permill, etc.
+     * For a percentage, set the suffixes to have "%" and the multiplier to be 100.
+     * (For Arabic, use arabic percent symbol).
+     * For a permill, set the suffixes to have "\\u2031" and the multiplier to be 1000.
+     *
+     * The number may also be multiplied by a power of ten; see getMultiplierScale().
+     *
+     * @return    the multiplier for use in percent, permill, etc.
+     * Examples: with 100, 1.23 -> "123", and "123" -> 1.23
+     * @stable ICU 2.0
+     */
+    int32_t getMultiplier(void) const;
+
+    /**
+     * Set the multiplier for use in percent, permill, etc.
+     * For a percentage, set the suffixes to have "%" and the multiplier to be 100.
+     * (For Arabic, use arabic percent symbol).
+     * For a permill, set the suffixes to have "\\u2031" and the multiplier to be 1000.
+     *
+     * This method only supports integer multipliers. To multiply by a non-integer, pair this
+     * method with setMultiplierScale().
+     *
+     * @param newValue    the new value of the multiplier for use in percent, permill, etc.
+     * Examples: with 100, 1.23 -> "123", and "123" -> 1.23
+     * @stable ICU 2.0
+     */
+    virtual void setMultiplier(int32_t newValue);
+
+    /**
+     * Gets the power of ten by which number should be multiplied before formatting, which
+     * can be combined with setMultiplier() to multiply by any arbitrary decimal value.
+     *
+     * A multiplier scale of 2 corresponds to multiplication by 100, and a multiplier scale
+     * of -2 corresponds to multiplication by 0.01.
+     *
+     * This method is analogous to UNUM_SCALE in getAttribute.
+     *
+     * @return    the current value of the power-of-ten multiplier.
+     * @stable ICU 62
+     */
+    int32_t getMultiplierScale(void) const;
+
+    /**
+     * Sets a power of ten by which number should be multiplied before formatting, which
+     * can be combined with setMultiplier() to multiply by any arbitrary decimal value.
+     *
+     * A multiplier scale of 2 corresponds to multiplication by 100, and a multiplier scale
+     * of -2 corresponds to multiplication by 0.01.
+     *
+     * For example, to multiply numbers by 0.5 before formatting, you can do:
+     *
+     * <pre>
+     * df.setMultiplier(5);
+     * df.setMultiplierScale(-1);
+     * </pre>
+     *
+     * This method is analogous to UNUM_SCALE in setAttribute.
+     *
+     * @param newValue    the new value of the power-of-ten multiplier.
+     * @stable ICU 62
+     */
+    void setMultiplierScale(int32_t newValue);
+
+    /**
+     * Get the rounding increment.
+     * @return A positive rounding increment, or 0.0 if a custom rounding
+     * increment is not in effect.
+     * @see #setRoundingIncrement
+     * @see #getRoundingMode
+     * @see #setRoundingMode
+     * @stable ICU 2.0
+     */
+    virtual double getRoundingIncrement(void) const;
+
+    /**
+     * Set the rounding increment.  In the absence of a rounding increment,
+     *    numbers will be rounded to the number of digits displayed.
+     * @param newValue A positive rounding increment, or 0.0 to
+     * use the default rounding increment.
+     * Negative increments are equivalent to 0.0.
+     * @see #getRoundingIncrement
+     * @see #getRoundingMode
+     * @see #setRoundingMode
+     * @stable ICU 2.0
+     */
+    virtual void setRoundingIncrement(double newValue);
+
+    /**
+     * Get the rounding mode.
+     * @return A rounding mode
+     * @see #setRoundingIncrement
+     * @see #getRoundingIncrement
+     * @see #setRoundingMode
+     * @stable ICU 2.0
+     */
+    virtual ERoundingMode getRoundingMode(void) const U_OVERRIDE;
+
+    /**
+     * Set the rounding mode.
+     * @param roundingMode A rounding mode
+     * @see #setRoundingIncrement
+     * @see #getRoundingIncrement
+     * @see #getRoundingMode
+     * @stable ICU 2.0
+     */
+    virtual void setRoundingMode(ERoundingMode roundingMode) U_OVERRIDE;
+
+    /**
+     * Get the width to which the output of format() is padded.
+     * The width is counted in 16-bit code units.
+     * @return the format width, or zero if no padding is in effect
+     * @see #setFormatWidth
+     * @see #getPadCharacterString
+     * @see #setPadCharacter
+     * @see #getPadPosition
+     * @see #setPadPosition
+     * @stable ICU 2.0
+     */
+    virtual int32_t getFormatWidth(void) const;
+
+    /**
+     * Set the width to which the output of format() is padded.
+     * The width is counted in 16-bit code units.
+     * This method also controls whether padding is enabled.
+     * @param width the width to which to pad the result of
+     * format(), or zero to disable padding.  A negative
+     * width is equivalent to 0.
+     * @see #getFormatWidth
+     * @see #getPadCharacterString
+     * @see #setPadCharacter
+     * @see #getPadPosition
+     * @see #setPadPosition
+     * @stable ICU 2.0
+     */
+    virtual void setFormatWidth(int32_t width);
+
+    /**
+     * Get the pad character used to pad to the format width.  The
+     * default is ' '.
+     * @return a string containing the pad character. This will always
+     * have a length of one 32-bit code point.
+     * @see #setFormatWidth
+     * @see #getFormatWidth
+     * @see #setPadCharacter
+     * @see #getPadPosition
+     * @see #setPadPosition
+     * @stable ICU 2.0
+     */
+    virtual UnicodeString getPadCharacterString() const;
+
+    /**
+     * Set the character used to pad to the format width.  If padding
+     * is not enabled, then this will take effect if padding is later
+     * enabled.
+     * @param padChar a string containing the pad character. If the string
+     * has length 0, then the pad character is set to ' '.  Otherwise
+     * padChar.char32At(0) will be used as the pad character.
+     * @see #setFormatWidth
+     * @see #getFormatWidth
+     * @see #getPadCharacterString
+     * @see #getPadPosition
+     * @see #setPadPosition
+     * @stable ICU 2.0
+     */
+    virtual void setPadCharacter(const UnicodeString& padChar);
+
+    /**
+     * Get the position at which padding will take place.  This is the location
+     * at which padding will be inserted if the result of format()
+     * is shorter than the format width.
+     * @return the pad position, one of kPadBeforePrefix,
+     * kPadAfterPrefix, kPadBeforeSuffix, or
+     * kPadAfterSuffix.
+     * @see #setFormatWidth
+     * @see #getFormatWidth
+     * @see #setPadCharacter
+     * @see #getPadCharacterString
+     * @see #setPadPosition
+     * @see #EPadPosition
+     * @stable ICU 2.0
+     */
+    virtual EPadPosition getPadPosition(void) const;
+
+    /**
+     * Set the position at which padding will take place.  This is the location
+     * at which padding will be inserted if the result of format()
+     * is shorter than the format width.  This has no effect unless padding is
+     * enabled.
+     * @param padPos the pad position, one of kPadBeforePrefix,
+     * kPadAfterPrefix, kPadBeforeSuffix, or
+     * kPadAfterSuffix.
+     * @see #setFormatWidth
+     * @see #getFormatWidth
+     * @see #setPadCharacter
+     * @see #getPadCharacterString
+     * @see #getPadPosition
+     * @see #EPadPosition
+     * @stable ICU 2.0
+     */
+    virtual void setPadPosition(EPadPosition padPos);
+
+    /**
+     * Return whether or not scientific notation is used.
+     * @return TRUE if this object formats and parses scientific notation
+     * @see #setScientificNotation
+     * @see #getMinimumExponentDigits
+     * @see #setMinimumExponentDigits
+     * @see #isExponentSignAlwaysShown
+     * @see #setExponentSignAlwaysShown
+     * @stable ICU 2.0
+     */
+    virtual UBool isScientificNotation(void) const;
+
+    /**
+     * Set whether or not scientific notation is used. When scientific notation
+     * is used, the effective maximum number of integer digits is <= 8.  If the
+     * maximum number of integer digits is set to more than 8, the effective
+     * maximum will be 1.  This allows this call to generate a 'default' scientific
+     * number format without additional changes.
+     * @param useScientific TRUE if this object formats and parses scientific
+     * notation
+     * @see #isScientificNotation
+     * @see #getMinimumExponentDigits
+     * @see #setMinimumExponentDigits
+     * @see #isExponentSignAlwaysShown
+     * @see #setExponentSignAlwaysShown
+     * @stable ICU 2.0
+     */
+    virtual void setScientificNotation(UBool useScientific);
+
+    /**
+     * Return the minimum exponent digits that will be shown.
+     * @return the minimum exponent digits that will be shown
+     * @see #setScientificNotation
+     * @see #isScientificNotation
+     * @see #setMinimumExponentDigits
+     * @see #isExponentSignAlwaysShown
+     * @see #setExponentSignAlwaysShown
+     * @stable ICU 2.0
+     */
+    virtual int8_t getMinimumExponentDigits(void) const;
+
+    /**
+     * Set the minimum exponent digits that will be shown.  This has no
+     * effect unless scientific notation is in use.
+     * @param minExpDig a value >= 1 indicating the fewest exponent digits
+     * that will be shown.  Values less than 1 will be treated as 1.
+     * @see #setScientificNotation
+     * @see #isScientificNotation
+     * @see #getMinimumExponentDigits
+     * @see #isExponentSignAlwaysShown
+     * @see #setExponentSignAlwaysShown
+     * @stable ICU 2.0
+     */
+    virtual void setMinimumExponentDigits(int8_t minExpDig);
+
+    /**
+     * Return whether the exponent sign is always shown.
+     * @return TRUE if the exponent is always prefixed with either the
+     * localized minus sign or the localized plus sign, false if only negative
+     * exponents are prefixed with the localized minus sign.
+     * @see #setScientificNotation
+     * @see #isScientificNotation
+     * @see #setMinimumExponentDigits
+     * @see #getMinimumExponentDigits
+     * @see #setExponentSignAlwaysShown
+     * @stable ICU 2.0
+     */
+    virtual UBool isExponentSignAlwaysShown(void) const;
+
+    /**
+     * Set whether the exponent sign is always shown.  This has no effect
+     * unless scientific notation is in use.
+     * @param expSignAlways TRUE if the exponent is always prefixed with either
+     * the localized minus sign or the localized plus sign, false if only
+     * negative exponents are prefixed with the localized minus sign.
+     * @see #setScientificNotation
+     * @see #isScientificNotation
+     * @see #setMinimumExponentDigits
+     * @see #getMinimumExponentDigits
+     * @see #isExponentSignAlwaysShown
+     * @stable ICU 2.0
+     */
+    virtual void setExponentSignAlwaysShown(UBool expSignAlways);
+
+    /**
+     * Return the grouping size. Grouping size is the number of digits between
+     * grouping separators in the integer portion of a number.  For example,
+     * in the number "123,456.78", the grouping size is 3.
+     *
+     * @return    the grouping size.
+     * @see setGroupingSize
+     * @see NumberFormat::isGroupingUsed
+     * @see DecimalFormatSymbols::getGroupingSeparator
+     * @stable ICU 2.0
+     */
+    int32_t getGroupingSize(void) const;
+
+    /**
+     * Set the grouping size. Grouping size is the number of digits between
+     * grouping separators in the integer portion of a number.  For example,
+     * in the number "123,456.78", the grouping size is 3.
+     *
+     * @param newValue    the new value of the grouping size.
+     * @see getGroupingSize
+     * @see NumberFormat::setGroupingUsed
+     * @see DecimalFormatSymbols::setGroupingSeparator
+     * @stable ICU 2.0
+     */
+    virtual void setGroupingSize(int32_t newValue);
+
+    /**
+     * Return the secondary grouping size. In some locales one
+     * grouping interval is used for the least significant integer
+     * digits (the primary grouping size), and another is used for all
+     * others (the secondary grouping size).  A formatter supporting a
+     * secondary grouping size will return a positive integer unequal
+     * to the primary grouping size returned by
+     * getGroupingSize().  For example, if the primary
+     * grouping size is 4, and the secondary grouping size is 2, then
+     * the number 123456789 formats as "1,23,45,6789", and the pattern
+     * appears as "#,##,###0".
+     * @return the secondary grouping size, or a value less than
+     * one if there is none
+     * @see setSecondaryGroupingSize
+     * @see NumberFormat::isGroupingUsed
+     * @see DecimalFormatSymbols::getGroupingSeparator
+     * @stable ICU 2.4
+     */
+    int32_t getSecondaryGroupingSize(void) const;
+
+    /**
+     * Set the secondary grouping size. If set to a value less than 1,
+     * then secondary grouping is turned off, and the primary grouping
+     * size is used for all intervals, not just the least significant.
+     *
+     * @param newValue    the new value of the secondary grouping size.
+     * @see getSecondaryGroupingSize
+     * @see NumberFormat#setGroupingUsed
+     * @see DecimalFormatSymbols::setGroupingSeparator
+     * @stable ICU 2.4
+     */
+    virtual void setSecondaryGroupingSize(int32_t newValue);
+
+    /**
+     * Returns the minimum number of grouping digits.
+     * Grouping separators are output if there are at least this many
+     * digits to the left of the first (rightmost) grouping separator,
+     * that is, there are at least (minimum grouping + grouping size) integer digits.
+     * (Subject to isGroupingUsed().)
+     *
+     * For example, if this value is 2, and the grouping size is 3, then
+     * 9999 -> "9999" and 10000 -> "10,000"
+     *
+     * The default value for this attribute is 0.
+     * A value of 1, 0, or lower, means that the use of grouping separators
+     * only depends on the grouping size (and on isGroupingUsed()).
+     *
+     * NOTE: The CLDR data is used in NumberFormatter but not in DecimalFormat.
+     * This is for backwards compatibility reasons.
+     *
+     * For more control over grouping strategies, use NumberFormatter.
+     *
+     * @see setMinimumGroupingDigits
+     * @see getGroupingSize
+     * @stable ICU 64
+     */
+    int32_t getMinimumGroupingDigits() const;
+
+    /**
+     * Sets the minimum grouping digits. Setting to a value less than or
+     * equal to 1 turns off minimum grouping digits.
+     *
+     * For more control over grouping strategies, use NumberFormatter.
+     *
+     * @param newValue the new value of minimum grouping digits.
+     * @see getMinimumGroupingDigits
+     * @stable ICU 64
+     */
+    void setMinimumGroupingDigits(int32_t newValue);
+
+    /**
+     * Allows you to get the behavior of the decimal separator with integers.
+     * (The decimal separator will always appear with decimals.)
+     *
+     * @return    TRUE if the decimal separator always appear with decimals.
+     * Example: Decimal ON: 12345 -> 12345.; OFF: 12345 -> 12345
+     * @stable ICU 2.0
+     */
+    UBool isDecimalSeparatorAlwaysShown(void) const;
+
+    /**
+     * Allows you to set the behavior of the decimal separator with integers.
+     * (The decimal separator will always appear with decimals.)
+     *
+     * @param newValue    set TRUE if the decimal separator will always appear with decimals.
+     * Example: Decimal ON: 12345 -> 12345.; OFF: 12345 -> 12345
+     * @stable ICU 2.0
+     */
+    virtual void setDecimalSeparatorAlwaysShown(UBool newValue);
+
+    /**
+     * Allows you to get the parse behavior of the pattern decimal mark.
+     *
+     * @return    TRUE if input must contain a match to decimal mark in pattern
+     * @stable ICU 54
+     */
+    UBool isDecimalPatternMatchRequired(void) const;
+
+    /**
+     * Allows you to set the parse behavior of the pattern decimal mark.
+     *
+     * if TRUE, the input must have a decimal mark if one was specified in the pattern. When
+     * FALSE the decimal mark may be omitted from the input.
+     *
+     * @param newValue    set TRUE if input must contain a match to decimal mark in pattern
+     * @stable ICU 54
+     */
+    virtual void setDecimalPatternMatchRequired(UBool newValue);
+
+    /**
+     * Returns whether to ignore exponents when parsing.
+     *
+     * @return Whether to ignore exponents when parsing.
+     * @see #setParseNoExponent
+     * @stable ICU 64
+     */
+    UBool isParseNoExponent() const;
+
+    /**
+     * Specifies whether to stop parsing when an exponent separator is encountered. For
+     * example, parses "123E4" to 123 (with parse position 3) instead of 1230000 (with parse position
+     * 5).
+     *
+     * @param value true to prevent exponents from being parsed; false to allow them to be parsed.
+     * @stable ICU 64
+     */
+    void setParseNoExponent(UBool value);
+
+    /**
+     * Returns whether parsing is sensitive to case (lowercase/uppercase).
+     *
+     * @return Whether parsing is case-sensitive.
+     * @see #setParseCaseSensitive
+     * @stable ICU 64
+     */
+    UBool isParseCaseSensitive() const;
+
+    /**
+     * Whether to pay attention to case when parsing; default is to ignore case (perform
+     * case-folding). For example, "A" == "a" in case-insensitive but not case-sensitive mode.
+     *
+     * Currency symbols are never case-folded. For example, "us$1.00" will not parse in case-insensitive
+     * mode, even though "US$1.00" parses.
+     *
+     * @param value true to enable case-sensitive parsing (the default); false to force
+     *              case-sensitive parsing behavior.
+     * @stable ICU 64
+     */
+    void setParseCaseSensitive(UBool value);
+
+    /**
+     * Returns whether truncation of high-order integer digits should result in an error.
+     * By default, setMaximumIntegerDigits truncates high-order digits silently.
+     *
+     * @return Whether an error code is set if high-order digits are truncated.
+     * @see setFormatFailIfMoreThanMaxDigits
+     * @stable ICU 64
+     */
+    UBool isFormatFailIfMoreThanMaxDigits() const;
+
+    /**
+     * Sets whether truncation of high-order integer digits should result in an error.
+     * By default, setMaximumIntegerDigits truncates high-order digits silently.
+     *
+     * @param value Whether to set an error code if high-order digits are truncated.
+     * @stable ICU 64
+     */
+    void setFormatFailIfMoreThanMaxDigits(UBool value);
+
+    /**
+     * Synthesizes a pattern string that represents the current state
+     * of this Format object.
+     *
+     * @param result    Output param which will receive the pattern.
+     *                  Previous contents are deleted.
+     * @return          A reference to 'result'.
+     * @see applyPattern
+     * @stable ICU 2.0
+     */
+    virtual UnicodeString& toPattern(UnicodeString& result) const;
+
+    /**
+     * Synthesizes a localized pattern string that represents the current
+     * state of this Format object.
+     *
+     * @param result    Output param which will receive the localized pattern.
+     *                  Previous contents are deleted.
+     * @return          A reference to 'result'.
+     * @see applyPattern
+     * @stable ICU 2.0
+     */
+    virtual UnicodeString& toLocalizedPattern(UnicodeString& result) const;
+
+    /**
+     * Apply the given pattern to this Format object.  A pattern is a
+     * short-hand specification for the various formatting properties.
+     * These properties can also be changed individually through the
+     * various setter methods.
+     * <P>
+     * There is no limit to integer digits are set
+     * by this routine, since that is the typical end-user desire;
+     * use setMaximumInteger if you want to set a real value.
+     * For negative numbers, use a second pattern, separated by a semicolon
+     * <pre>
+     * .      Example "#,#00.0#" -> 1,234.56
+     * </pre>
+     * This means a minimum of 2 integer digits, 1 fraction digit, and
+     * a maximum of 2 fraction digits.
+     * <pre>
+     * .      Example: "#,#00.0#;(#,#00.0#)" for negatives in parantheses.
+     * </pre>
+     * In negative patterns, the minimum and maximum counts are ignored;
+     * these are presumed to be set in the positive pattern.
+     *
+     * @param pattern    The pattern to be applied.
+     * @param parseError Struct to recieve information on position
+     *                   of error if an error is encountered
+     * @param status     Output param set to success/failure code on
+     *                   exit. If the pattern is invalid, this will be
+     *                   set to a failure result.
+     * @stable ICU 2.0
+     */
+    virtual void applyPattern(const UnicodeString& pattern, UParseError& parseError, UErrorCode& status);
+
+    /**
+     * Sets the pattern.
+     * @param pattern   The pattern to be applied.
+     * @param status    Output param set to success/failure code on
+     *                  exit. If the pattern is invalid, this will be
+     *                  set to a failure result.
+     * @stable ICU 2.0
+     */
+    virtual void applyPattern(const UnicodeString& pattern, UErrorCode& status);
+
+    /**
+     * Apply the given pattern to this Format object.  The pattern
+     * is assumed to be in a localized notation. A pattern is a
+     * short-hand specification for the various formatting properties.
+     * These properties can also be changed individually through the
+     * various setter methods.
+     * <P>
+     * There is no limit to integer digits are set
+     * by this routine, since that is the typical end-user desire;
+     * use setMaximumInteger if you want to set a real value.
+     * For negative numbers, use a second pattern, separated by a semicolon
+     * <pre>
+     * .      Example "#,#00.0#" -> 1,234.56
+     * </pre>
+     * This means a minimum of 2 integer digits, 1 fraction digit, and
+     * a maximum of 2 fraction digits.
+     *
+     * Example: "#,#00.0#;(#,#00.0#)" for negatives in parantheses.
+     *
+     * In negative patterns, the minimum and maximum counts are ignored;
+     * these are presumed to be set in the positive pattern.
+     *
+     * @param pattern   The localized pattern to be applied.
+     * @param parseError Struct to recieve information on position
+     *                   of error if an error is encountered
+     * @param status    Output param set to success/failure code on
+     *                  exit. If the pattern is invalid, this will be
+     *                  set to a failure result.
+     * @stable ICU 2.0
+     */
+    virtual void applyLocalizedPattern(const UnicodeString& pattern, UParseError& parseError,
+                                       UErrorCode& status);
+
+    /**
+     * Apply the given pattern to this Format object.
+     *
+     * @param pattern   The localized pattern to be applied.
+     * @param status    Output param set to success/failure code on
+     *                  exit. If the pattern is invalid, this will be
+     *                  set to a failure result.
+     * @stable ICU 2.0
+     */
+    virtual void applyLocalizedPattern(const UnicodeString& pattern, UErrorCode& status);
+
+
+    /**
+     * Sets the maximum number of digits allowed in the integer portion of a
+     * number. This override limits the integer digit count to 309.
+     *
+     * @param newValue    the new value of the maximum number of digits
+     *                      allowed in the integer portion of a number.
+     * @see NumberFormat#setMaximumIntegerDigits
+     * @stable ICU 2.0
+     */
+    void setMaximumIntegerDigits(int32_t newValue) U_OVERRIDE;
+
+    /**
+     * Sets the minimum number of digits allowed in the integer portion of a
+     * number. This override limits the integer digit count to 309.
+     *
+     * @param newValue    the new value of the minimum number of digits
+     *                      allowed in the integer portion of a number.
+     * @see NumberFormat#setMinimumIntegerDigits
+     * @stable ICU 2.0
+     */
+    void setMinimumIntegerDigits(int32_t newValue) U_OVERRIDE;
+
+    /**
+     * Sets the maximum number of digits allowed in the fraction portion of a
+     * number. This override limits the fraction digit count to 340.
+     *
+     * @param newValue    the new value of the maximum number of digits
+     *                    allowed in the fraction portion of a number.
+     * @see NumberFormat#setMaximumFractionDigits
+     * @stable ICU 2.0
+     */
+    void setMaximumFractionDigits(int32_t newValue) U_OVERRIDE;
+
+    /**
+     * Sets the minimum number of digits allowed in the fraction portion of a
+     * number. This override limits the fraction digit count to 340.
+     *
+     * @param newValue    the new value of the minimum number of digits
+     *                    allowed in the fraction portion of a number.
+     * @see NumberFormat#setMinimumFractionDigits
+     * @stable ICU 2.0
+     */
+    void setMinimumFractionDigits(int32_t newValue) U_OVERRIDE;
+
+    /**
+     * Returns the minimum number of significant digits that will be
+     * displayed. This value has no effect unless areSignificantDigitsUsed()
+     * returns true.
+     * @return the fewest significant digits that will be shown
+     * @stable ICU 3.0
+     */
+    int32_t getMinimumSignificantDigits() const;
+
+    /**
+     * Returns the maximum number of significant digits that will be
+     * displayed. This value has no effect unless areSignificantDigitsUsed()
+     * returns true.
+     * @return the most significant digits that will be shown
+     * @stable ICU 3.0
+     */
+    int32_t getMaximumSignificantDigits() const;
+
+    /**
+     * Sets the minimum number of significant digits that will be
+     * displayed.  If <code>min</code> is less than one then it is set
+     * to one.  If the maximum significant digits count is less than
+     * <code>min</code>, then it is set to <code>min</code>.
+     * This function also enables the use of significant digits
+     * by this formatter - areSignificantDigitsUsed() will return TRUE.
+     * @see #areSignificantDigitsUsed
+     * @param min the fewest significant digits to be shown
+     * @stable ICU 3.0
+     */
+    void setMinimumSignificantDigits(int32_t min);
+
+    /**
+     * Sets the maximum number of significant digits that will be
+     * displayed.  If <code>max</code> is less than one then it is set
+     * to one.  If the minimum significant digits count is greater
+     * than <code>max</code>, then it is set to <code>max</code>.
+     * This function also enables the use of significant digits
+     * by this formatter - areSignificantDigitsUsed() will return TRUE.
+     * @see #areSignificantDigitsUsed
+     * @param max the most significant digits to be shown
+     * @stable ICU 3.0
+     */
+    void setMaximumSignificantDigits(int32_t max);
+
+    /**
+     * Returns true if significant digits are in use, or false if
+     * integer and fraction digit counts are in use.
+     * @return true if significant digits are in use
+     * @stable ICU 3.0
+     */
+    UBool areSignificantDigitsUsed() const;
+
+    /**
+     * Sets whether significant digits are in use, or integer and
+     * fraction digit counts are in use.
+     * @param useSignificantDigits true to use significant digits, or
+     * false to use integer and fraction digit counts
+     * @stable ICU 3.0
+     */
+    void setSignificantDigitsUsed(UBool useSignificantDigits);
+
+    /**
+     * Sets the currency used to display currency
+     * amounts.  This takes effect immediately, if this format is a
+     * currency format.  If this format is not a currency format, then
+     * the currency is used if and when this object becomes a
+     * currency format through the application of a new pattern.
+     * @param theCurrency a 3-letter ISO code indicating new currency
+     * to use.  It need not be null-terminated.  May be the empty
+     * string or NULL to indicate no currency.
+     * @param ec input-output error code
+     * @stable ICU 3.0
+     */
+    void setCurrency(const char16_t* theCurrency, UErrorCode& ec) U_OVERRIDE;
+
+#ifndef U_FORCE_HIDE_DEPRECATED_API
+    /**
+     * Sets the currency used to display currency amounts.  See
+     * setCurrency(const char16_t*, UErrorCode&).
+     * @deprecated ICU 3.0. Use setCurrency(const char16_t*, UErrorCode&).
+     */
+    virtual void setCurrency(const char16_t* theCurrency);
+#endif  // U_FORCE_HIDE_DEPRECATED_API
+
+    /**
+     * Sets the `Currency Usage` object used to display currency.
+     * This takes effect immediately, if this format is a
+     * currency format.
+     * @param newUsage new currency usage object to use.
+     * @param ec input-output error code
+     * @stable ICU 54
+     */
+    void setCurrencyUsage(UCurrencyUsage newUsage, UErrorCode* ec);
+
+    /**
+     * Returns the `Currency Usage` object used to display currency
+     * @stable ICU 54
+     */
+    UCurrencyUsage getCurrencyUsage() const;
+
+#ifndef U_HIDE_INTERNAL_API
+
+    /**
+     *  Format a number and save it into the given DecimalQuantity.
+     *  Internal, not intended for public use.
+     *  @internal
+     */
+    void formatToDecimalQuantity(double number, number::impl::DecimalQuantity& output,
+                                 UErrorCode& status) const;
+
+    /**
+     *  Get a DecimalQuantity corresponding to a formattable as it would be
+     *  formatted by this DecimalFormat.
+     *  Internal, not intended for public use.
+     *  @internal
+     */
+    void formatToDecimalQuantity(const Formattable& number, number::impl::DecimalQuantity& output,
+                                 UErrorCode& status) const;
+
+#endif  /* U_HIDE_INTERNAL_API */
+
+    /**
+     * Converts this DecimalFormat to a (Localized)NumberFormatter. Starting
+     * in ICU 60, NumberFormatter is the recommended way to format numbers.
+     * You can use the returned LocalizedNumberFormatter to format numbers and
+     * get a FormattedNumber, which contains a string as well as additional
+     * annotations about the formatted value.
+     * 
+     * If a memory allocation failure occurs, the return value of this method
+     * might be null. If you are concerned about correct recovery from
+     * out-of-memory situations, use this pattern:
+     *
+     * <pre>
+     * FormattedNumber result;
+     * if (auto* ptr = df->toNumberFormatter(status)) {
+     *     result = ptr->formatDouble(123, status);
+     * }
+     * </pre>
+     *
+     * If you are not concerned about out-of-memory situations, or if your
+     * environment throws exceptions when memory allocation failure occurs,
+     * you can chain the methods, like this:
+     *
+     * <pre>
+     * FormattedNumber result = df
+     *     ->toNumberFormatter(status)
+     *     ->formatDouble(123, status);
+     * </pre>
+     *
+     * NOTE: The returned LocalizedNumberFormatter is owned by this DecimalFormat.
+     * If a non-const method is called on the DecimalFormat, or if the DecimalFormat
+     * is deleted, the object becomes invalid. If you plan to keep the return value
+     * beyond the lifetime of the DecimalFormat, copy it to a local variable:
+     *
+     * <pre>
+     * LocalizedNumberFormatter lnf;
+     * if (auto* ptr = df->toNumberFormatter(status)) {
+     *     lnf = *ptr;
+     * }
+     * </pre>
+     *
+     * @param status Set on failure, like U_MEMORY_ALLOCATION_ERROR.
+     * @return A pointer to an internal object, or nullptr on failure.
+     *         Do not delete the return value!
+     * @stable ICU 64
+     */
+    const number::LocalizedNumberFormatter* toNumberFormatter(UErrorCode& status) const;
+
+    /**
+     * Return the class ID for this class.  This is useful only for
+     * comparing to a return value from getDynamicClassID().  For example:
+     * <pre>
+     * .      Base* polymorphic_pointer = createPolymorphicObject();
+     * .      if (polymorphic_pointer->getDynamicClassID() ==
+     * .          Derived::getStaticClassID()) ...
+     * </pre>
+     * @return          The class ID for all objects of this class.
+     * @stable ICU 2.0
+     */
+    static UClassID U_EXPORT2 getStaticClassID(void);
+
+    /**
+     * Returns a unique class ID POLYMORPHICALLY.  Pure virtual override.
+     * This method is to implement a simple version of RTTI, since not all
+     * C++ compilers support genuine RTTI.  Polymorphic operator==() and
+     * clone() methods call this method.
+     *
+     * @return          The class ID for this object. All objects of a
+     *                  given class have the same class ID.  Objects of
+     *                  other classes have different class IDs.
+     * @stable ICU 2.0
+     */
+    UClassID getDynamicClassID(void) const U_OVERRIDE;
+
+  private:
+
+    /** Rebuilds the formatter object from the property bag. */
+    void touch(UErrorCode& status);
+
+    /** Rebuilds the formatter object, ignoring any error code. */
+    void touchNoError();
+
+    /**
+     * Updates the property bag with settings from the given pattern.
+     *
+     * @param pattern The pattern string to parse.
+     * @param ignoreRounding Whether to leave out rounding information (minFrac, maxFrac, and rounding
+     *     increment) when parsing the pattern. This may be desirable if a custom rounding mode, such
+     *     as CurrencyUsage, is to be used instead. One of {@link
+     *     PatternStringParser#IGNORE_ROUNDING_ALWAYS}, {@link PatternStringParser#IGNORE_ROUNDING_IF_CURRENCY},
+     *     or {@link PatternStringParser#IGNORE_ROUNDING_NEVER}.
+     * @see PatternAndPropertyUtils#parseToExistingProperties
+     */
+    void setPropertiesFromPattern(const UnicodeString& pattern, int32_t ignoreRounding,
+                                  UErrorCode& status);
+
+    const numparse::impl::NumberParserImpl* getParser(UErrorCode& status) const;
+
+    const numparse::impl::NumberParserImpl* getCurrencyParser(UErrorCode& status) const;
+
+    static void fieldPositionHelper(
+        const number::impl::UFormattedNumberData& formatted,
+        FieldPosition& fieldPosition,
+        int32_t offset,
+        UErrorCode& status);
+
+    static void fieldPositionIteratorHelper(
+        const number::impl::UFormattedNumberData& formatted,
+        FieldPositionIterator* fpi,
+        int32_t offset,
+        UErrorCode& status);
+
+    void setupFastFormat();
+
+    bool fastFormatDouble(double input, UnicodeString& output) const;
+
+    bool fastFormatInt64(int64_t input, UnicodeString& output) const;
+
+    void doFastFormatInt32(int32_t input, bool isNegative, UnicodeString& output) const;
+
+    //=====================================================================================//
+    //                                   INSTANCE FIELDS                                   //
+    //=====================================================================================//
+
+
+    // One instance field for the implementation, keep all fields inside of an implementation
+    // class defined in number_mapper.h
+    number::impl::DecimalFormatFields* fields = nullptr;
+
+    // Allow child class CompactDecimalFormat to access fProperties:
+    friend class CompactDecimalFormat;
+
+    // Allow MeasureFormat to use fieldPositionHelper:
+    friend class MeasureFormat;
+
+};
+
+U_NAMESPACE_END
+
+#endif /* #if !UCONFIG_NO_FORMATTING */
+
+#endif /* U_SHOW_CPLUSPLUS_API */
+
+#endif // _DECIMFMT
+//eof