1 // © 2017 and later: Unicode, Inc. and others. 2 // License & terms of use: http://www.unicode.org/copyright.html 3 4 #include "unicode/utypes.h" 5 6 #if !UCONFIG_NO_FORMATTING 7 #ifndef __NUMBER_DECNUM_H__ 8 #define __NUMBER_DECNUM_H__ 9 10 #include "decNumber.h" 11 #include "charstr.h" 12 #include "bytesinkutil.h" 13 14 U_NAMESPACE_BEGIN 15 16 #define DECNUM_INITIAL_CAPACITY 34 17 18 // Export an explicit template instantiation of the MaybeStackHeaderAndArray that is used as a data member of DecNum. 19 // When building DLLs for Windows this is required even though no direct access to the MaybeStackHeaderAndArray leaks out of the i18n library. 20 // (See digitlst.h, pluralaffix.h, datefmt.h, and others for similar examples.) 21 #if U_PF_WINDOWS <= U_PLATFORM && U_PLATFORM <= U_PF_CYGWIN 22 template class U_I18N_API MaybeStackHeaderAndArray<decNumber, char, DECNUM_INITIAL_CAPACITY>; 23 #endif 24 25 namespace number { 26 namespace impl { 27 28 /** A very thin C++ wrapper around decNumber.h */ 29 // Exported as U_I18N_API for tests 30 class U_I18N_API DecNum : public UMemory { 31 public: 32 DecNum(); // leaves object in valid but undefined state 33 34 // Copy-like constructor; use the default move operators. 35 DecNum(const DecNum& other, UErrorCode& status); 36 37 /** Sets the decNumber to the StringPiece. */ 38 void setTo(StringPiece str, UErrorCode& status); 39 40 /** Sets the decNumber to the NUL-terminated char string. */ 41 void setTo(const char* str, UErrorCode& status); 42 43 /** Uses double_conversion to set this decNumber to the given double. */ 44 void setTo(double d, UErrorCode& status); 45 46 /** Sets the decNumber to the BCD representation. */ 47 void setTo(const uint8_t* bcd, int32_t length, int32_t scale, bool isNegative, UErrorCode& status); 48 49 void normalize(); 50 51 void multiplyBy(const DecNum& rhs, UErrorCode& status); 52 53 void divideBy(const DecNum& rhs, UErrorCode& status); 54 55 bool isNegative() const; 56 57 bool isZero() const; 58 59 void toString(ByteSink& output, UErrorCode& status) const; 60 toCharString(UErrorCode & status)61 inline CharString toCharString(UErrorCode& status) const { 62 CharString cstr; 63 CharStringByteSink sink(&cstr); 64 toString(sink, status); 65 return cstr; 66 } 67 getRawDecNumber()68 inline const decNumber* getRawDecNumber() const { 69 return fData.getAlias(); 70 } 71 72 private: 73 static constexpr int32_t kDefaultDigits = DECNUM_INITIAL_CAPACITY; 74 MaybeStackHeaderAndArray<decNumber, char, kDefaultDigits> fData; 75 decContext fContext; 76 77 void _setTo(const char* str, int32_t maxDigits, UErrorCode& status); 78 }; 79 80 } // namespace impl 81 } // namespace number 82 83 U_NAMESPACE_END 84 85 #endif // __NUMBER_DECNUM_H__ 86 87 #endif /* #if !UCONFIG_NO_FORMATTING */ 88