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diff --git a/intl/icu/source/i18n/pluralranges.h b/intl/icu/source/i18n/pluralranges.h
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+++ b/intl/icu/source/i18n/pluralranges.h
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+// © 2018 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+
+#ifndef __PLURALRANGES_H__
+#define __PLURALRANGES_H__
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_FORMATTING
+
+#include "unicode/uobject.h"
+#include "unicode/locid.h"
+#include "unicode/plurrule.h"
+#include "standardplural.h"
+#include "cmemory.h"
+
+U_NAMESPACE_BEGIN
+
+// Forward declarations
+namespace number {
+namespace impl {
+class UFormattedNumberRangeData;
+}
+}
+
+class StandardPluralRanges : public UMemory {
+  public:
+    /** Create a new StandardPluralRanges for the given locale */
+    static StandardPluralRanges forLocale(const Locale& locale, UErrorCode& status);
+
+    /** Explicit copy constructor */
+    StandardPluralRanges copy(UErrorCode& status) const;
+
+    /** Create an object (called on an rvalue) */
+    LocalPointer<StandardPluralRanges> toPointer(UErrorCode& status) && noexcept;
+
+    /** Select rule based on the first and second forms */
+    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, UErrorCode& status);
+
+  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;
+};
+
+U_NAMESPACE_END
+
+#endif /* #if !UCONFIG_NO_FORMATTING */
+#endif //__PLURALRANGES_H__