Dan Albert | 287553d | 2017-02-16 10:47:51 -0800 | [diff] [blame] | 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> |
| 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> |
| 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: |