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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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20 02110-1301, USA. |
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21 |
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22 */ |
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23 |
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24 #if !defined (octave_DET_h) |
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25 #define octave_DET_h 1 |
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26 |
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27 #include <iostream> |
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28 |
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29 // FIXME -- we could use templates here; compare with CmplxDET.h |
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30 |
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31 class |
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32 DET |
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33 { |
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34 friend class Matrix; |
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35 friend class SparseMatrix; |
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36 |
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37 public: |
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38 |
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39 DET (void) : c2 (0), c10 (0), e2 (0), e10 (0), base2 (false) { } |
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40 |
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41 DET (const DET& a) |
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42 : c2 (a.c2), c10 (a.c10), e2 (a.e2), e10 (a.e10), base2 (a.base2) |
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43 { } |
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44 |
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45 DET& operator = (const DET& a) |
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46 { |
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47 if (this != &a) |
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48 { |
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49 c2 = a.c2; |
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50 e2 = a.e2; |
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51 |
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52 c10 = a.c10; |
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53 e10 = a.e10; |
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54 |
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55 base2 = a.base2; |
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56 } |
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57 return *this; |
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58 } |
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59 |
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60 bool value_will_overflow (void) const; |
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61 bool value_will_underflow (void) const; |
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62 |
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63 // These two functions were originally defined in base 10, so we are |
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64 // preserving that interface here. |
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65 |
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66 double coefficient (void) const { return coefficient10 (); } |
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67 int exponent (void) const { return exponent10 (); } |
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68 |
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69 double coefficient10 (void) const { return c10; } |
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70 int exponent10 (void) const { return e10; } |
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71 |
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72 double coefficient2 (void) const { return c2; } |
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73 int exponent2 (void) const { return e2; } |
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74 |
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75 double value (void) const; |
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76 |
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77 friend std::ostream& operator << (std::ostream& os, const DET& a); |
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78 |
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79 private: |
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80 |
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81 // Constructed this way, we assume base 2. |
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82 |
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83 DET (double c, int e) |
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84 : c2 (c), c10 (0), e2 (e), e10 (0), base2 (true) |
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85 { |
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86 initialize10 (); |
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87 } |
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88 |
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89 // Original interface had only this constructor and it was assumed |
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90 // to be base 10, so we are preserving that interface here. |
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91 |
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92 DET (const double *d) |
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93 : c2 (0), c10 (d[0]), e2 (0), e10 (static_cast<int> (d[1])), base2 (false) |
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94 { |
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95 initialize2 (); |
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96 } |
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97 |
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98 void initialize2 (void); |
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99 void initialize10 (void); |
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100 |
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101 double c2; |
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102 double c10; |
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103 |
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104 int e2; |
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105 int e10; |
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106 |
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107 // TRUE means the original values were provided in base 2. |
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108 bool base2; |
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109 }; |
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110 |
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111 #endif |
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112 |
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113 /* |
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114 ;;; Local Variables: *** |
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115 ;;; mode: C++ *** |
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116 ;;; End: *** |
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117 */ |
