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/* Compiler implementation of the D programming language
* Copyright (C) 1999-2019 by The D Language Foundation, All Rights Reserved
* written by Walter Bright
* http://www.digitalmars.com
* Distributed under the Boost Software License, Version 1.0.
* http://www.boost.org/LICENSE_1_0.txt
* https://github.com/dlang/dmd/blob/master/src/dmd/complex_t.h
*/
#pragma once
#include "root/ctfloat.h"
/* Roll our own complex type for compilers that don't support complex
*/
struct complex_t
{
real_t re;
real_t im;
complex_t(real_t re) : re(re), im(ldouble(0)) {}
complex_t(real_t re, real_t im) : re(re), im(im) {}
complex_t operator + (complex_t y) { return complex_t(re + y.re, im + y.im); }
complex_t operator - (complex_t y) { return complex_t(re - y.re, im - y.im); }
complex_t operator - () { return complex_t(-re, -im); }
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)
{
if (CTFloat::fabs(y.re) < CTFloat::fabs(y.im))
{
real_t r = y.re / y.im;
real_t den = y.im + r * y.re;
return complex_t((re * r + im) / den,
(im * r - re) / den);
}
else
{
real_t r = y.im / y.re;
real_t 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; }
private:
complex_t() : re(ldouble(0)), im(ldouble(0)) {}
};
inline complex_t operator * (real_t x, complex_t y) { return complex_t(x) * y; }
inline complex_t operator * (complex_t x, real_t y) { return x * complex_t(y); }
inline complex_t operator / (complex_t x, real_t y) { return x / complex_t(y); }
inline real_t creall(complex_t x)
{
return x.re;
}
inline real_t cimagl(complex_t x)
{
return x.im;
}