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
18 struct complex_t
19 {
20 real_t re;
21 real_t im;
22
complex_tcomplex_t23 complex_t(real_t re) : re(re), im(ldouble(0)) {}
complex_tcomplex_t24 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
54 private:
complex_tcomplex_t55 complex_t() : re(ldouble(0)), im(ldouble(0)) {}
56 };
57
58 inline complex_t operator * (real_t x, complex_t y) { return complex_t(x) * y; }
59 inline complex_t operator * (complex_t x, real_t y) { return x * complex_t(y); }
60 inline complex_t operator / (complex_t x, real_t y) { return x / complex_t(y); }
61
62
creall(complex_t x)63 inline real_t creall(complex_t x)
64 {
65 return x.re;
66 }
67
cimagl(complex_t x)68 inline real_t cimagl(complex_t x)
69 {
70 return x.im;
71 }
72