icuSources/i18n/number_decnum.h

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