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      1 
      2 /* Compiler implementation of the D programming language
      3  * Copyright (C) 1999-2022 by The D Language Foundation, All Rights Reserved
      4  * written by Walter Bright
      5  * https://www.digitalmars.com
      6  * Distributed under the Boost Software License, Version 1.0.
      7  * https://www.boost.org/LICENSE_1_0.txt
      8  * https://github.com/dlang/dmd/blob/master/src/dmd/root/complex_t.h
      9  */
     10 
     11 #pragma once
     12 
     13 #include "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 
     23     complex_t(real_t re) : re(re), im(CTFloat::zero) {}
     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 
     54 private:
     55     complex_t() : re(CTFloat::zero), im(CTFloat::zero) {}
     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 
     63 inline real_t creall(complex_t x)
     64 {
     65     return x.re;
     66 }
     67 
     68 inline real_t cimagl(complex_t x)
     69 {
     70     return x.im;
     71 }
     72