1 2/* Compiler implementation of the D programming language 3 * Copyright (C) 1999-2019 by The D Language Foundation, All Rights Reserved 4 * written by Walter Bright 5 * http://www.digitalmars.com 6 * Distributed under the Boost Software License, Version 1.0. 7 * http://www.boost.org/LICENSE_1_0.txt 8 * https://github.com/dlang/dmd/blob/master/src/dmd/complex_t.h 9 */ 10 11#pragma once 12 13#include "root/ctfloat.h" 14 15/* Roll our own complex type for compilers that don't support complex 16 */ 17 18struct complex_t 19{ 20 real_t re; 21 real_t im; 22 23 complex_t(real_t re) : re(re), im(ldouble(0)) {} 24 complex_t(real_t re, real_t im) : re(re), im(im) {} 25 26 complex_t operator + (complex_t y) { return complex_t(re + y.re, im + y.im); } 27 complex_t operator - (complex_t y) { return complex_t(re - y.re, im - y.im); } 28 complex_t operator - () { return complex_t(-re, -im); } 29 complex_t operator * (complex_t y) { return complex_t(re * y.re - im * y.im, im * y.re + re * y.im); } 30 31 complex_t operator / (complex_t y) 32 { 33 if (CTFloat::fabs(y.re) < CTFloat::fabs(y.im)) 34 { 35 real_t r = y.re / y.im; 36 real_t den = y.im + r * y.re; 37 return complex_t((re * r + im) / den, 38 (im * r - re) / den); 39 } 40 else 41 { 42 real_t r = y.im / y.re; 43 real_t den = y.re + r * y.im; 44 return complex_t((re + r * im) / den, 45 (im - r * re) / den); 46 } 47 } 48 49 operator bool () { return re || im; } 50 51 int operator == (complex_t y) { return re == y.re && im == y.im; } 52 int operator != (complex_t y) { return re != y.re || im != y.im; } 53 54private: 55 complex_t() : re(ldouble(0)), im(ldouble(0)) {} 56}; 57 58inline complex_t operator * (real_t x, complex_t y) { return complex_t(x) * y; } 59inline complex_t operator * (complex_t x, real_t y) { return x * complex_t(y); } 60inline complex_t operator / (complex_t x, real_t y) { return x / complex_t(y); } 61 62 63inline real_t creall(complex_t x) 64{ 65 return x.re; 66} 67 68inline real_t cimagl(complex_t x) 69{ 70 return x.im; 71} 72