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
13U_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
21template class U_I18N_API MaybeStackHeaderAndArray<decNumber, char, DECNUM_INITIAL_CAPACITY>;
22#endif
23
24namespace number {
25namespace impl {
26
27/** A very thin C++ wrapper around decNumber.h */
28// Exported as U_I18N_API for tests
29class 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 void toString(ByteSink& output, UErrorCode& status) const;
59
60 inline const decNumber* getRawDecNumber() const {
61 return fData.getAlias();
62 }
63
64 private:
65 static constexpr int32_t kDefaultDigits = DECNUM_INITIAL_CAPACITY;
66 MaybeStackHeaderAndArray<decNumber, char, kDefaultDigits> fData;
67 decContext fContext;
68
69 void _setTo(const char* str, int32_t maxDigits, UErrorCode& status);
70};
71
72} // namespace impl
73} // namespace number
74
75U_NAMESPACE_END
76
77#endif // __NUMBER_DECNUM_H__
78
79#endif /* #if !UCONFIG_NO_FORMATTING */
80