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// Compiler implementation of the D programming language
// Copyright (c) 1999-2006 by Digital Mars
// All Rights Reserved
// written by Walter Bright and Burton Radons
// http://www.digitalmars.com
// License for redistribution is by either the Artistic License
// in artistic.txt, or the GNU General Public License in gnu.txt.
// See the included readme.txt for details.
#ifndef DMD_COMPLEX_T_H
#define DMD_COMPLEX_T_H
/* Roll our own complex type for compilers that don't support complex
*/
struct complex_t
{
longdouble re;
longdouble im;
complex_t() { this->re = 0; this->im = 0; }
complex_t(longdouble re) { this->re = re; this->im = 0; }
complex_t(double re) { this->re = re; this->im = 0; }
complex_t(longdouble re, longdouble im) { this->re = re; this->im = im; }
complex_t(double re, double im) { this->re = re; this->im = im; }
complex_t operator + (complex_t y) { complex_t r; r.re = re + y.re; r.im = im + y.im; return r; }
complex_t operator - (complex_t y) { complex_t r; r.re = re - y.re; r.im = im - y.im; return r; }
complex_t operator - () { complex_t r; r.re = -re; r.im = -im; return r; }
complex_t operator * (complex_t y) { return complex_t(re * y.re - im * y.im, im * y.re + re * y.im); }
complex_t operator / (complex_t y)
{
longdouble abs_y_re = y.re < 0 ? -y.re : y.re;
longdouble abs_y_im = y.im < 0 ? -y.im : y.im;
longdouble r, den;
if (abs_y_re < abs_y_im)
{
r = y.re / y.im;
den = y.im + r * y.re;
return complex_t((re * r + im) / den,
(im * r - re) / den);
}
else
{
r = y.im / y.re;
den = y.re + r * y.im;
return complex_t((re + r * im) / den,
(im - r * re) / den);
}
}
operator bool () { return re || im; }
int operator == (complex_t y) { return re == y.re && im == y.im; }
int operator != (complex_t y) { return re != y.re || im != y.im; }
};
inline complex_t operator * (longdouble x, complex_t y) { return complex_t(x) * y; }
inline complex_t operator * (complex_t x, longdouble y) { return x * complex_t(y); }
inline complex_t operator / (complex_t x, longdouble y) { return x / complex_t(y); }
inline longdouble creall(complex_t x)
{
return x.re;
}
inline longdouble cimagl(complex_t x)
{
return x.im;
}
#endif
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