vcl_complex.h

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#ifndef vcl_complex_h_
#define vcl_complex_h_

#include "vcl_compiler.h"

// File: vcl_complex.h
//
// The task of this horrible file is to rationalize the complex number
// support in the various compilers.  Basically it promises to give you:
//
// A working vcl_complex<T> template.
//
// Stream >> and << operators.
//
// Instances of the types vcl_complex<float> and vcl_complex<double>
//
// A macro VCL_COMPLEX_INSTANTIATE(T) which allows you to instantiate
// complex over other number types.


// ---------- all emulation
#if !VCL_USE_NATIVE_COMPLEX
# include "emulation/vcl_complex.h"

#elif defined(VCL_STLPORT)
# include "stlport/vcl_complex.h"

// ---------- Visual Studio 6
#elif defined(VCL_VC60)
# include "win32-vc60/vcl_complex.h"

// ---------- Visual Studio 7.0
#elif defined(VCL_VC70)
# include "win32-vc70/vcl_complex.h"

// ---------- SunPro compiler
#elif defined(VCL_SUNPRO_CC)
# include "sunpro/vcl_complex.h"

// ---------- SGI 7*0
#elif defined(VCL_SGI_CC_7) && _COMPILER_VERSION < 740
#include  "sgi/vcl_complex.h"

// ---------- MW
#elif defined(VCL_METRO_WERKS)
#include  "mwerks/vcl_complex.h"

// ---------- GCC 2.95
#elif defined(VCL_GCC_295)
#include  "gcc-295/vcl_complex.h"

// ---------- Borland 5.5
#elif defined(VCL_BORLAND_55)
# include "borland55/vcl_complex.h"

// ---------- Borland 5.6
#elif defined(VCL_BORLAND_56)
#include  "borland56/vcl_complex.h"

// ---------- ISO
#else
# include "iso/vcl_complex.h"
#endif


# if !VCL_COMPLEX_POW_WORKS && !defined(VCL_SGI_CC_7)
#  undef vcl_pow
#  define vcl_pow vcl_pow
// several implementations of pow are wrong.
// e.g. pow(complex<double>(-1.0,0.0), 0.5) returns (Nan, 0) rather than (0,1).

template <class T> inline vcl_complex<T>
  vcl_pow(const vcl_complex<T>& xin, int y)
{
  vcl_complex<T> r = 1.0;
  vcl_complex<T> x = xin;
  if (y < 0) {
    y = -y;
    x = ((T)1)/x; }
  while (y) {
    if (y & 1)   r *= x;
    if (y >>= 1) x *= x; }
  return r;
}

template <class T> inline vcl_complex<T>
  vcl_pow(const vcl_complex<T>& x, const T& y)
{
  return vcl_exp(y * vcl_log(x));
}

template <class T> inline vcl_complex<T>
  vcl_pow(const T& x, const vcl_complex<T>& y)
{
  return vcl_exp(y * vcl_log(vcl_complex<T>(x, T(0))));
}

template <class T> inline vcl_complex<T>
  vcl_pow(const vcl_complex<T>& x, const vcl_complex<T>& y)
{
  return vcl_exp(y * vcl_log(x));
}

# endif // !VCL_COMPLEX_POW_WORKS


#if 0
// this breaks the sunpro build. it should be moved so that
// it is only seen by compilers that need it. - fsm.
inline vcl_complex<double> operator*(float c, vcl_complex<double> const &z) { return z * (double)c; }
inline vcl_complex<double> operator*(vcl_complex<double> const &z, float c) { return z * (double)c; }
inline vcl_complex<float > operator*(double c, vcl_complex<float> const &z) { return z * (float)c; }
inline vcl_complex<float > operator*(vcl_complex<float> const &z, double c) { return z * (float)c; }
inline vcl_complex<double> operator/(vcl_complex<double> const &z, float c) { return z / (double)c; }
inline vcl_complex<float > operator/(vcl_complex<float> const &z, double c) { return z / (float)c; }
#endif

//--------------------------------------------------------------------------------

// bogus instantiation macro.
#define VCL_COMPLEX_INSTANTIATE(T) extern "you must include vcl_complex.txx instead"

#if VCL_USE_IMPLICIT_TEMPLATES
# include "vcl_complex.txx"
#endif

#endif // vcl_complex_h_