1 files changed, 94 insertions, 0 deletions
diff --git a/intl/icu/source/i18n/number_decnum.h b/intl/icu/source/i18n/number_decnum.h
new file mode 100644
index 0000000000..94a0b31bcb
--- /dev/null
+++ b/intl/icu/source/i18n/number_decnum.h
@@ -0,0 +1,94 @@
+// © 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_DECNUM_H__
+#define __NUMBER_DECNUM_H__
+
+#include "decNumber.h"
+#include "charstr.h"
+#include "bytesinkutil.h"
+
+U_NAMESPACE_BEGIN
+
+#define DECNUM_INITIAL_CAPACITY 34
+
+// Export an explicit template instantiation of the MaybeStackHeaderAndArray that is used as a data member of DecNum.
+// When building DLLs for Windows this is required even though no direct access to the MaybeStackHeaderAndArray leaks out of the i18n library.
+// (See digitlst.h, pluralaffix.h, datefmt.h, and others for similar examples.)
+#if U_PF_WINDOWS <= U_PLATFORM && U_PLATFORM <= U_PF_CYGWIN
+template class U_I18N_API MaybeStackHeaderAndArray<decNumber, char, DECNUM_INITIAL_CAPACITY>;
+#endif
+
+namespace number {
+namespace impl {
+
+/** A very thin C++ wrapper around decNumber.h */
+// Exported as U_I18N_API for tests
+class U_I18N_API DecNum : public UMemory {
+  public:
+    DecNum();  // leaves object in valid but undefined state
+
+    // Copy-like constructor; use the default move operators.
+    DecNum(const DecNum& other, UErrorCode& status);
+
+    /** Sets the decNumber to the StringPiece. */
+    void setTo(StringPiece str, UErrorCode& status);
+
+    /** Sets the decNumber to the NUL-terminated char string. */
+    void setTo(const char* str, UErrorCode& status);
+
+    /** Uses double_conversion to set this decNumber to the given double. */
+    void setTo(double d, UErrorCode& status);
+
+    /** Sets the decNumber to the BCD representation. */
+    void setTo(const uint8_t* bcd, int32_t length, int32_t scale, bool isNegative, UErrorCode& status);
+
+    void normalize();
+
+    void multiplyBy(const DecNum& rhs, UErrorCode& status);
+
+    void divideBy(const DecNum& rhs, UErrorCode& status);
+
+    bool isNegative() const;
+
+    bool isZero() const;
+
+    /** Is infinity or NaN */
+    bool isSpecial() const;
+
+    bool isInfinity() const;
+
+    bool isNaN() const;
+
+    void toString(ByteSink& output, UErrorCode& status) const;
+
+    inline CharString toCharString(UErrorCode& status) const {
+      CharString cstr;
+      CharStringByteSink sink(&cstr);
+      toString(sink, status);
+      return cstr;
+    }
+
+    inline const decNumber* getRawDecNumber() const {
+        return fData.getAlias();
+    }
+
+  private:
+    static constexpr int32_t kDefaultDigits = DECNUM_INITIAL_CAPACITY;
+    MaybeStackHeaderAndArray<decNumber, char, kDefaultDigits> fData;
+    decContext fContext;
+
+    void _setTo(const char* str, int32_t maxDigits, UErrorCode& status);
+};
+
+} // namespace impl
+} // namespace number
+
+U_NAMESPACE_END
+
+#endif // __NUMBER_DECNUM_H__
+
+#endif /* #if !UCONFIG_NO_FORMATTING */