lib/3rdparty/stlport/stlport/stl/_complex.c

   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: