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diff --git a/intl/icu/source/i18n/numrange_impl.h b/intl/icu/source/i18n/numrange_impl.h
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+// © 2018 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 __SOURCE_NUMRANGE_TYPES_H__
+#define __SOURCE_NUMRANGE_TYPES_H__
+
+#include "unicode/numberformatter.h"
+#include "unicode/numberrangeformatter.h"
+#include "unicode/simpleformatter.h"
+#include "number_types.h"
+#include "number_decimalquantity.h"
+#include "number_formatimpl.h"
+#include "formatted_string_builder.h"
+#include "formattedval_impl.h"
+
+U_NAMESPACE_BEGIN namespace number {
+namespace impl {
+
+
+/**
+ * Class similar to UFormattedNumberData.
+ *
+ * Has incomplete magic number logic that will need to be finished
+ * if this is to be exposed as C API in the future.
+ *
+ * Possible magic number: 0x46445200
+ * Reads in ASCII as "FDR" (FormatteDnumberRange with room at the end)
+ */
+class UFormattedNumberRangeData : public FormattedValueStringBuilderImpl {
+public:
+    UFormattedNumberRangeData() : FormattedValueStringBuilderImpl(kUndefinedField) {}
+    virtual ~UFormattedNumberRangeData();
+
+    DecimalQuantity quantity1;
+    DecimalQuantity quantity2;
+    UNumberRangeIdentityResult identityResult = UNUM_IDENTITY_RESULT_COUNT;
+};
+
+
+class StandardPluralRanges : public UMemory {
+  public:
+    void initialize(const Locale& locale, UErrorCode& status);
+    StandardPlural::Form resolve(StandardPlural::Form first, StandardPlural::Form second) const;
+
+    /** Used for data loading. */
+    void addPluralRange(
+        StandardPlural::Form first,
+        StandardPlural::Form second,
+        StandardPlural::Form result);
+
+    /** Used for data loading. */
+    void setCapacity(int32_t length);
+
+  private:
+    struct StandardPluralRangeTriple {
+        StandardPlural::Form first;
+        StandardPlural::Form second;
+        StandardPlural::Form result;
+    };
+
+    // TODO: An array is simple here, but it results in linear lookup time.
+    // Certain locales have 20-30 entries in this list.
+    // Consider changing to a smarter data structure.
+    typedef MaybeStackArray<StandardPluralRangeTriple, 3> PluralRangeTriples;
+    PluralRangeTriples fTriples;
+    int32_t fTriplesLen = 0;
+};
+
+
+class NumberRangeFormatterImpl : public UMemory {
+  public:
+    NumberRangeFormatterImpl(const RangeMacroProps& macros, UErrorCode& status);
+
+    void format(UFormattedNumberRangeData& data, bool equalBeforeRounding, UErrorCode& status) const;
+
+  private:
+    NumberFormatterImpl formatterImpl1;
+    NumberFormatterImpl formatterImpl2;
+    bool fSameFormatters;
+
+    UNumberRangeCollapse fCollapse;
+    UNumberRangeIdentityFallback fIdentityFallback;
+
+    SimpleFormatter fRangeFormatter;
+    SimpleModifier fApproximatelyModifier;
+
+    StandardPluralRanges fPluralRanges;
+
+    void formatSingleValue(UFormattedNumberRangeData& data,
+                           MicroProps& micros1, MicroProps& micros2,
+                           UErrorCode& status) const;
+
+    void formatApproximately(UFormattedNumberRangeData& data,
+                             MicroProps& micros1, MicroProps& micros2,
+                             UErrorCode& status) const;
+
+    void formatRange(UFormattedNumberRangeData& data,
+                     MicroProps& micros1, MicroProps& micros2,
+                     UErrorCode& status) const;
+
+    const Modifier& resolveModifierPlurals(const Modifier& first, const Modifier& second) const;
+};
+
+
+} // namespace impl
+} // namespace number
+U_NAMESPACE_END
+
+#endif //__SOURCE_NUMRANGE_TYPES_H__
+#endif /* #if !UCONFIG_NO_FORMATTING */