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annotate dmd2/complex_t.h @ 1112:829ac3f30103
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author | Frits van Bommel <fvbommel wxs.nl> |
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date | Fri, 13 Mar 2009 16:18:01 +0100 |
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1 |
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2 // Compiler implementation of the D programming language |
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3 // Copyright (c) 1999-2006 by Digital Mars |
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4 // All Rights Reserved |
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5 // written by Walter Bright and Burton Radons |
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6 // http://www.digitalmars.com |
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7 // License for redistribution is by either the Artistic License |
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8 // in artistic.txt, or the GNU General Public License in gnu.txt. |
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9 // See the included readme.txt for details. |
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10 |
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11 #ifndef DMD_COMPLEX_T_H |
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12 #define DMD_COMPLEX_T_H |
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13 |
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14 /* Roll our own complex type for compilers that don't support complex |
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15 */ |
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16 |
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17 struct complex_t |
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18 { |
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19 long double re; |
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20 long double im; |
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21 |
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22 complex_t() { this->re = 0; this->im = 0; } |
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23 complex_t(long double re) { this->re = re; this->im = 0; } |
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24 complex_t(long double re, long double im) { this->re = re; this->im = im; } |
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25 |
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26 complex_t operator + (complex_t y) { complex_t r; r.re = re + y.re; r.im = im + y.im; return r; } |
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27 complex_t operator - (complex_t y) { complex_t r; r.re = re - y.re; r.im = im - y.im; return r; } |
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28 complex_t operator - () { complex_t r; r.re = -re; r.im = -im; return r; } |
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29 complex_t operator * (complex_t y) { return complex_t(re * y.re - im * y.im, im * y.re + re * y.im); } |
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30 |
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31 complex_t operator / (complex_t y) |
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32 { |
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33 long double abs_y_re = y.re < 0 ? -y.re : y.re; |
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34 long double abs_y_im = y.im < 0 ? -y.im : y.im; |
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35 long double r, den; |
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36 |
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37 if (abs_y_re < abs_y_im) |
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38 { |
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39 r = y.re / y.im; |
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40 den = y.im + r * y.re; |
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41 return complex_t((re * r + im) / den, |
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42 (im * r - re) / den); |
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43 } |
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44 else |
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45 { |
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46 r = y.im / y.re; |
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47 den = y.re + r * y.im; |
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48 return complex_t((re + r * im) / den, |
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49 (im - r * re) / den); |
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50 } |
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51 } |
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52 |
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53 operator bool () { return re || im; } |
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54 |
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55 int operator == (complex_t y) { return re == y.re && im == y.im; } |
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56 int operator != (complex_t y) { return re != y.re || im != y.im; } |
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57 }; |
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58 |
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59 inline complex_t operator * (long double x, complex_t y) { return complex_t(x) * y; } |
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60 inline complex_t operator * (complex_t x, long double y) { return x * complex_t(y); } |
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61 inline complex_t operator / (complex_t x, long double y) { return x / complex_t(y); } |
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62 |
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63 |
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64 inline long double creall(complex_t x) |
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65 { |
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66 return x.re; |
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67 } |
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68 |
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69 inline long double cimagl(complex_t x) |
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70 { |
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71 return x.im; |
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72 } |
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73 |
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74 #endif |