Mercurial > octave-nkf
annotate liboctave/util/lo-traits.h @ 20651:e54ecb33727e
lo-array-gripes.cc: Remove FIXME's related to buffer size.
* lo-array-gripes.cc: Remove FIXME's related to buffer size. Shorten sprintf
buffers from 100 to 64 characters (still well more than 19 required).
Use 'const' decorator on constant value for clarity. Remove extra space
between variable and array bracket.
| author | Rik <rik@octave.org> |
|---|---|
| date | Mon, 12 Oct 2015 21:13:47 -0700 |
| parents | 4197fc428c7d |
| children |
| rev | line source |
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| 8725 | 1 /* |
| 2 | |
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3 Copyright (C) 2009-2015 John W. Eaton |
| 8725 | 4 |
| 5 This file is part of Octave. | |
| 6 | |
| 7 Octave is free software; you can redistribute it and/or modify it | |
| 8 under the terms of the GNU General Public License as published by the | |
| 9 Free Software Foundation; either version 3 of the License, or (at your | |
| 10 option) any later version. | |
| 11 | |
| 12 Octave is distributed in the hope that it will be useful, but WITHOUT | |
| 13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 15 for more details. | |
| 16 | |
| 17 You should have received a copy of the GNU General Public License | |
| 18 along with Octave; see the file COPYING. If not, see | |
| 19 <http://www.gnu.org/licenses/>. | |
| 20 | |
| 21 */ | |
| 22 | |
|
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23 #if !defined (octave_lo_traits_h) |
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24 #define octave_lo_traits_h 1 |
| 8725 | 25 |
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26 // Ideas for these classes taken from C++ Templates, The Complete |
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27 // Guide by David Vandevoorde and Nicolai M. Josuttis, Addison-Wesley |
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28 // (2003). |
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29 |
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30 // Select a type based on the value of a constant expression. |
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31 |
| 8725 | 32 template <bool cond, typename T1, typename T2> |
| 33 class if_then_else; | |
| 34 | |
| 35 template<typename T1, typename T2> | |
| 36 class if_then_else<true, T1, T2> | |
| 37 { | |
| 38 public: | |
| 39 | |
| 40 typedef T1 result; | |
| 41 }; | |
| 42 | |
| 43 template<typename T1, typename T2> | |
| 44 class if_then_else<false, T1, T2> | |
| 45 { | |
| 46 public: | |
| 47 | |
| 48 typedef T2 result; | |
| 49 }; | |
| 50 | |
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51 // Determine whether two types are equal. |
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52 template <class T1, class T2> |
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53 class equal_types |
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54 { |
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55 public: |
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56 |
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57 static const bool value = false; |
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58 }; |
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59 |
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60 template <class T> |
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61 class equal_types <T, T> |
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62 { |
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63 public: |
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64 |
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65 static const bool value = true; |
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66 }; |
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67 |
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68 // Determine whether a type is an instance of a template. |
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69 |
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70 template <template <class> class Template, class T> |
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71 class is_instance |
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72 { |
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73 public: |
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74 |
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75 static const bool value = false; |
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76 }; |
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77 |
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78 template <template <class> class Template, class T> |
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79 class is_instance <Template, Template<T> > |
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80 { |
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81 public: |
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82 |
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83 static const bool value = true; |
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84 }; |
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85 |
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86 // Determine whether a template paramter is a class type. |
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87 |
| 8725 | 88 template<typename T1> |
| 89 class is_class_type | |
| 90 { | |
| 91 private: | |
| 92 | |
| 93 typedef char one; | |
| 94 typedef struct { char c[2]; } two; | |
| 95 | |
| 96 // Classes can have pointers to members. | |
| 97 template<typename T2> static one is_class_type_test (int T2::*); | |
| 98 | |
| 99 // Catch everything else. | |
| 100 template<typename T2> static two is_class_type_test (...); | |
| 101 | |
| 102 public: | |
| 103 | |
| 104 enum { yes = sizeof (is_class_type_test<T1> (0)) == 1 }; | |
| 105 enum { no = ! yes }; | |
| 106 }; | |
| 107 | |
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108 // Define typename ref_param<T>::type as T const& if T is a class |
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109 // type. Otherwise, define it to be T. |
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110 |
| 8725 | 111 template<typename T> |
| 112 class ref_param | |
| 113 { | |
| 114 public: | |
| 115 | |
| 116 typedef typename if_then_else<is_class_type<T>::no, T, T const&>::result type; | |
| 117 }; | |
| 118 | |
| 9685 | 119 // Will turn TemplatedClass<T> to T, leave T otherwise. |
| 120 // Useful for stripping wrapper classes, like octave_int. | |
| 121 | |
| 122 template<template<typename> class TemplatedClass, typename T> | |
| 123 class strip_template_param | |
| 124 { | |
| 125 public: | |
| 126 typedef T type; | |
| 127 }; | |
| 128 | |
| 129 template<template<typename> class TemplatedClass, typename T> | |
| 130 class strip_template_param<TemplatedClass, TemplatedClass<T> > | |
| 131 { | |
| 132 public: | |
| 133 typedef T type; | |
| 134 }; | |
| 135 | |
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136 // Will turn TemplatedClass<T> to TemplatedClass<S>, T to S otherwise. |
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137 // Useful for generic promotions. |
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138 |
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139 template<template<typename> class TemplatedClass, typename T, typename S> |
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140 class subst_template_param |
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141 { |
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142 public: |
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143 typedef S type; |
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144 }; |
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145 |
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146 template<template<typename> class TemplatedClass, typename T, typename S> |
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147 class subst_template_param<TemplatedClass, TemplatedClass<T>, S> |
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148 { |
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149 public: |
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150 typedef TemplatedClass<S> type; |
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151 }; |
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152 |
| 8725 | 153 #endif |