ReactOS 0.4.15-dev-7906-g1b85a5f
_complex.c
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1/*
2 * Copyright (c) 1999
3 * Silicon Graphics Computer Systems, Inc.
4 *
5 * Copyright (c) 1999
6 * Boris Fomitchev
7 *
8 * This material is provided "as is", with absolutely no warranty expressed
9 * or implied. Any use is at your own risk.
10 *
11 * Permission to use or copy this software for any purpose is hereby granted
12 * without fee, provided the above notices are retained on all copies.
13 * Permission to modify the code and to distribute modified code is granted,
14 * provided the above notices are retained, and a notice that the code was
15 * modified is included with the above copyright notice.
16 *
17 */
18#ifndef _STLP_COMPLEX_C
19#define _STLP_COMPLEX_C
20
21#ifndef _STLP_INTERNAL_COMPLEX
22# include <stl/_complex.h>
23#endif
24
25#if !defined (_STLP_USE_NO_IOSTREAMS)
26# ifndef _STLP_INTERNAL_ISTREAM
27# include <stl/_istream.h>
28# endif
29
30# ifndef _STLP_INTERNAL_SSTREAM
31# include <stl/_sstream.h>
32# endif
33
34# ifndef _STLP_STRING_IO_H
35# include <stl/_string_io.h>
36# endif
37#endif
38
40
41// Non-inline member functions.
42
43template <class _Tp>
44void complex<_Tp>::_div(const _Tp& __z1_r, const _Tp& __z1_i,
45 const _Tp& __z2_r, const _Tp& __z2_i,
46 _Tp& __res_r, _Tp& __res_i) {
47 _Tp __ar = __z2_r >= 0 ? __z2_r : -__z2_r;
48 _Tp __ai = __z2_i >= 0 ? __z2_i : -__z2_i;
49
50 if (__ar <= __ai) {
51 _Tp __ratio = __z2_r / __z2_i;
52 _Tp __denom = __z2_i * (1 + __ratio * __ratio);
53 __res_r = (__z1_r * __ratio + __z1_i) / __denom;
54 __res_i = (__z1_i * __ratio - __z1_r) / __denom;
55 }
56 else {
57 _Tp __ratio = __z2_i / __z2_r;
58 _Tp __denom = __z2_r * (1 + __ratio * __ratio);
59 __res_r = (__z1_r + __z1_i * __ratio) / __denom;
60 __res_i = (__z1_i - __z1_r * __ratio) / __denom;
61 }
62}
63
64template <class _Tp>
65void complex<_Tp>::_div(const _Tp& __z1_r,
66 const _Tp& __z2_r, const _Tp& __z2_i,
67 _Tp& __res_r, _Tp& __res_i) {
68 _Tp __ar = __z2_r >= 0 ? __z2_r : -__z2_r;
69 _Tp __ai = __z2_i >= 0 ? __z2_i : -__z2_i;
70
71 if (__ar <= __ai) {
72 _Tp __ratio = __z2_r / __z2_i;
73 _Tp __denom = __z2_i * (1 + __ratio * __ratio);
74 __res_r = (__z1_r * __ratio) / __denom;
75 __res_i = - __z1_r / __denom;
76 }
77 else {
78 _Tp __ratio = __z2_i / __z2_r;
79 _Tp __denom = __z2_r * (1 + __ratio * __ratio);
80 __res_r = __z1_r / __denom;
81 __res_i = - (__z1_r * __ratio) / __denom;
82 }
83}
84
85// I/O.
86#if !defined (_STLP_USE_NO_IOSTREAMS)
87
88// Complex output, in the form (re,im). We use a two-step process
89// involving stringstream so that we get the padding right.
90template <class _Tp, class _CharT, class _Traits>
94 __tmp.flags(__os.flags());
95 __tmp.imbue(__os.getloc());
96 __tmp.precision(__os.precision());
97 __tmp << '(' << __z.real() << ',' << __z.imag() << ')';
98 return __os << __tmp.str();
99}
100
101// Complex input from arbitrary streams. Note that results in some
102// locales may be confusing, since the decimal character varies with
103// locale and the separator between real and imaginary parts does not.
104
105template <class _Tp, class _CharT, class _Traits>
108 _Tp __re = 0;
109 _Tp __im = 0;
110
111 const ctype<_CharT>& __c_type = *__is._M_ctype_facet();
112
113 const char __punct[4] = "(,)";
114 _CharT __wpunct[3];
115 __c_type.widen(__punct, __punct + 3, __wpunct);
116
117 _CharT __c;
118
119 __is >> __c;
120 if (_Traits::eq(__c, __wpunct[0])) { // Left paren
121 __is >> __re >> __c;
122 if (_Traits::eq(__c, __wpunct[1])) // Comma
123 __is >> __im >> __c;
124 if (!_Traits::eq(__c, __wpunct[2])) // Right paren
125 __is.setstate(ios_base::failbit);
126 }
127 else {
128 __is.putback(__c);
129 __is >> __re;
130 }
131
132 if (__is)
133 __z = complex<_Tp>(__re, __im);
134 return __is;
135}
136
137#endif /* _STLP_USE_NO_IOSTREAMS */
138
140
141#endif /* _STLP_COMPLEX_C */
142
143// Local Variables:
144// mode:C++
145// End:
#define _STLP_CALL
Definition: _bc.h:131
basic_ostream< _CharT, _Traits > &_STLP_CALL operator<<(basic_ostream< _CharT, _Traits > &__os, const complex< _Tp > &__z)
Definition: _complex.c:92
basic_istream< _CharT, _Traits > &_STLP_CALL operator>>(basic_istream< _CharT, _Traits > &__is, complex< _Tp > &__z)
Definition: _complex.c:107
locale imbue(const locale &)
Definition: _ios.c:69
const ctype< char_type > * _M_ctype_facet() const
Definition: _ios.h:121
void setstate(iostate __state)
Definition: _ios.h:95
_Self & putback(char_type __c)
Definition: _istream.c:422
_String str() const
Definition: _sstream.h:184
Definition: _ctype.h:58
fmtflags flags() const
Definition: _ios_base.h:107
locale getloc() const
Definition: _ios_base.h:143
streamsize precision() const
Definition: _ios_base.h:127
#define _STLP_BEGIN_NAMESPACE
Definition: features.h:501
#define _STLP_END_NAMESPACE
Definition: features.h:503
#define __c
Definition: schilyio.h:209
value_type real() const
Definition: _complex.h:69
static void _STLP_CALL _div(const value_type &__z1_r, const value_type &__z1_i, const value_type &__z2_r, const value_type &__z2_i, value_type &__res_r, value_type &__res_i)
Definition: _complex.c:44
value_type imag() const
Definition: _complex.h:70