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
39 _STLP_BEGIN_NAMESPACE
40
41 // Non-inline member functions.
42
43 template <class _Tp>
_div(const _Tp & __z1_r,const _Tp & __z1_i,const _Tp & __z2_r,const _Tp & __z2_i,_Tp & __res_r,_Tp & __res_i)44 void 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
64 template <class _Tp>
_div(const _Tp & __z1_r,const _Tp & __z2_r,const _Tp & __z2_i,_Tp & __res_r,_Tp & __res_i)65 void 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.
90 template <class _Tp, class _CharT, class _Traits>
91 basic_ostream<_CharT, _Traits>& _STLP_CALL
92 operator<<(basic_ostream<_CharT, _Traits>& __os, const complex<_Tp>& __z) {
93 basic_ostringstream<_CharT, _Traits, allocator<_CharT> > __tmp;
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
105 template <class _Tp, class _CharT, class _Traits>
106 basic_istream<_CharT, _Traits>& _STLP_CALL
107 operator>>(basic_istream<_CharT, _Traits>& __is, complex<_Tp>& __z) {
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
139 _STLP_END_NAMESPACE
140
141 #endif /* _STLP_COMPLEX_C */
142
143 // Local Variables:
144 // mode:C++
145 // End:
146