| |
| /* 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; |
| } |