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diff --git a/intl/icu/source/i18n/number_patternmodifier.h b/intl/icu/source/i18n/number_patternmodifier.h
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+// © 2017 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_FORMATTING
+#ifndef __NUMBER_PATTERNMODIFIER_H__
+#define __NUMBER_PATTERNMODIFIER_H__
+
+#include "standardplural.h"
+#include "unicode/numberformatter.h"
+#include "number_patternstring.h"
+#include "number_types.h"
+#include "number_modifiers.h"
+#include "number_utils.h"
+#include "number_currencysymbols.h"
+
+U_NAMESPACE_BEGIN
+
+// Export an explicit template instantiation of the LocalPointer that is used as a
+// data member of AdoptingModifierStore.
+// (When building DLLs for Windows this is required.)
+#if U_PF_WINDOWS <= U_PLATFORM && U_PLATFORM <= U_PF_CYGWIN
+#if defined(_MSC_VER)
+// Ignore warning 4661 as LocalPointerBase does not use operator== or operator!=
+#pragma warning(push)
+#pragma warning(disable : 4661)
+#endif
+template class U_I18N_API LocalPointerBase<number::impl::AdoptingModifierStore>;
+template class U_I18N_API LocalPointer<number::impl::AdoptingModifierStore>;
+#if defined(_MSC_VER)
+#pragma warning(pop)
+#endif
+#endif
+
+namespace number {
+namespace impl {
+
+// Forward declaration
+class MutablePatternModifier;
+
+// Exported as U_I18N_API because it is needed for the unit test PatternModifierTest
+class U_I18N_API ImmutablePatternModifier : public MicroPropsGenerator, public UMemory {
+  public:
+    ~ImmutablePatternModifier() override = default;
+
+    void processQuantity(DecimalQuantity&, MicroProps& micros, UErrorCode& status) const override;
+
+    void applyToMicros(MicroProps& micros, const DecimalQuantity& quantity, UErrorCode& status) const;
+
+    const Modifier* getModifier(Signum signum, StandardPlural::Form plural) const;
+
+    // Non-const method:
+    void addToChain(const MicroPropsGenerator* parent);
+
+  private:
+    ImmutablePatternModifier(AdoptingModifierStore* pm, const PluralRules* rules);
+
+    const LocalPointer<AdoptingModifierStore> pm;
+    const PluralRules* rules;
+    const MicroPropsGenerator* parent;
+
+    friend class MutablePatternModifier;
+};
+
+/**
+ * This class is a {@link Modifier} that wraps a decimal format pattern. It applies the pattern's affixes in
+ * {@link Modifier#apply}.
+ *
+ * <p>
+ * In addition to being a Modifier, this class contains the business logic for substituting the correct locale symbols
+ * into the affixes of the decimal format pattern.
+ *
+ * <p>
+ * In order to use this class, create a new instance and call the following four setters: {@link #setPatternInfo},
+ * {@link #setPatternAttributes}, {@link #setSymbols}, and {@link #setNumberProperties}. After calling these four
+ * setters, the instance will be ready for use as a Modifier.
+ *
+ * <p>
+ * This is a MUTABLE, NON-THREAD-SAFE class designed for performance. Do NOT save references to this or attempt to use
+ * it from multiple threads! Instead, you can obtain a safe, immutable decimal format pattern modifier by calling
+ * {@link MutablePatternModifier#createImmutable}, in effect treating this instance as a builder for the immutable
+ * variant.
+ */
+class U_I18N_API MutablePatternModifier
+        : public MicroPropsGenerator,
+          public Modifier,
+          public SymbolProvider,
+          public UMemory {
+  public:
+
+    ~MutablePatternModifier() override = default;
+
+    /**
+     * @param isStrong
+     *            Whether the modifier should be considered strong. For more information, see
+     *            {@link Modifier#isStrong()}. Most of the time, decimal format pattern modifiers should be considered
+     *            as non-strong.
+     */
+    explicit MutablePatternModifier(bool isStrong);
+
+    /**
+     * Sets a reference to the parsed decimal format pattern, usually obtained from
+     * {@link PatternStringParser#parseToPatternInfo(String)}, but any implementation of {@link AffixPatternProvider} is
+     * accepted.
+     *
+     * @param field
+     *            Which field to use for literal characters in the pattern.
+     */
+    void setPatternInfo(const AffixPatternProvider *patternInfo, Field field);
+
+    /**
+     * Sets attributes that imply changes to the literal interpretation of the pattern string affixes.
+     *
+     * @param signDisplay
+     *            Whether to force a plus sign on positive numbers.
+     * @param perMille
+     *            Whether to substitute the percent sign in the pattern with a permille sign.
+     * @param approximately
+     *            Whether to prepend approximately to the sign
+     */
+    void setPatternAttributes(UNumberSignDisplay signDisplay, bool perMille, bool approximately);
+
+    /**
+     * Sets locale-specific details that affect the symbols substituted into the pattern string affixes.
+     *
+     * @param symbols
+     *            The desired instance of DecimalFormatSymbols.
+     * @param currency
+     *            The currency to be used when substituting currency values into the affixes.
+     * @param unitWidth
+     *            The width used to render currencies.
+     * @param rules
+     *            Required if the triple currency sign, "¤¤¤", appears in the pattern, which can be determined from the
+     *            convenience method {@link #needsPlurals()}.
+     * @param status
+     *            Set if an error occurs while loading currency data.
+     */
+    void setSymbols(const DecimalFormatSymbols* symbols, const CurrencyUnit& currency,
+                    UNumberUnitWidth unitWidth, const PluralRules* rules, UErrorCode& status);
+
+    /**
+     * Sets attributes of the current number being processed.
+     *
+     * @param signum
+     *            -1 if negative; +1 if positive; or 0 if zero.
+     * @param plural
+     *            The plural form of the number, required only if the pattern contains the triple
+     *            currency sign, "¤¤¤" (and as indicated by {@link #needsPlurals()}).
+     */
+    void setNumberProperties(Signum signum, StandardPlural::Form plural);
+
+    /**
+     * Returns true if the pattern represented by this MurkyModifier requires a plural keyword in order to localize.
+     * This is currently true only if there is a currency long name placeholder in the pattern ("¤¤¤").
+     */
+    bool needsPlurals() const;
+
+    /** Creates a quantity-dependent Modifier for the specified plural form. */
+    AdoptingSignumModifierStore createImmutableForPlural(StandardPlural::Form plural, UErrorCode& status);
+
+    /**
+     * Creates a new quantity-dependent Modifier that behaves the same as the current instance, but which is immutable
+     * and can be saved for future use. The number properties in the current instance are mutated; all other properties
+     * are left untouched.
+     *
+     * <p>
+     * The resulting modifier cannot be used in a QuantityChain.
+     *
+     * <p>
+     * CREATES A NEW HEAP OBJECT; THE CALLER GETS OWNERSHIP.
+     *
+     * @return An immutable that supports both positive and negative numbers.
+     */
+    ImmutablePatternModifier *createImmutable(UErrorCode &status);
+
+    MicroPropsGenerator &addToChain(const MicroPropsGenerator *parent);
+
+    void processQuantity(DecimalQuantity &, MicroProps &micros, UErrorCode &status) const override;
+
+    int32_t apply(FormattedStringBuilder &output, int32_t leftIndex, int32_t rightIndex,
+                  UErrorCode &status) const override;
+
+    int32_t getPrefixLength() const override;
+
+    int32_t getCodePointCount() const override;
+
+    bool isStrong() const override;
+
+    bool containsField(Field field) const override;
+
+    void getParameters(Parameters& output) const override;
+
+    bool semanticallyEquivalent(const Modifier& other) const override;
+
+    /**
+     * Returns the string that substitutes a given symbol type in a pattern.
+     */
+    UnicodeString getSymbol(AffixPatternType type) const override;
+
+    /**
+     * Returns the currency symbol for the unit width specified in setSymbols()
+     */
+    UnicodeString getCurrencySymbolForUnitWidth(UErrorCode& status) const;
+
+    UnicodeString toUnicodeString() const;
+
+  private:
+    // Modifier details (initialized in constructor)
+    const bool fStrong;
+
+    // Pattern details (initialized in setPatternInfo and setPatternAttributes)
+    const AffixPatternProvider *fPatternInfo;
+    Field fField;
+    UNumberSignDisplay fSignDisplay;
+    bool fPerMilleReplacesPercent;
+    bool fApproximately;
+
+    // Symbol details (initialized in setSymbols)
+    const DecimalFormatSymbols *fSymbols;
+    UNumberUnitWidth fUnitWidth;
+    CurrencySymbols fCurrencySymbols;
+    const PluralRules *fRules;
+
+    // Number details (initialized in setNumberProperties)
+    Signum fSignum;
+    StandardPlural::Form fPlural;
+
+    // QuantityChain details (initialized in addToChain)
+    const MicroPropsGenerator *fParent;
+
+    // Transient fields for rendering
+    UnicodeString currentAffix;
+
+    /**
+     * Uses the current properties to create a single {@link ConstantMultiFieldModifier} with currency spacing support
+     * if required.
+     *
+     * <p>
+     * CREATES A NEW HEAP OBJECT; THE CALLER GETS OWNERSHIP.
+     *
+     * @param a
+     *            A working FormattedStringBuilder object; passed from the outside to prevent the need to create many new
+     *            instances if this method is called in a loop.
+     * @param b
+     *            Another working FormattedStringBuilder object.
+     * @return The constant modifier object.
+     */
+    ConstantMultiFieldModifier *createConstantModifier(UErrorCode &status);
+
+    int32_t insertPrefix(FormattedStringBuilder &sb, int position, UErrorCode &status);
+
+    int32_t insertSuffix(FormattedStringBuilder &sb, int position, UErrorCode &status);
+
+    void prepareAffix(bool isPrefix);
+};
+
+
+}  // namespace impl
+}  // namespace number
+U_NAMESPACE_END
+
+#endif //__NUMBER_PATTERNMODIFIER_H__
+
+#endif /* #if !UCONFIG_NO_FORMATTING */