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1 #ifndef OTHER_DWA20020601_HPP |
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2 # define OTHER_DWA20020601_HPP |
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3 |
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4 # include <boost/python/detail/prefix.hpp> |
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5 // Copyright David Abrahams 2002. |
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6 // Distributed under the Boost Software License, Version 1.0. (See |
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7 // accompanying file LICENSE_1_0.txt or copy at |
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8 // http://www.boost.org/LICENSE_1_0.txt) |
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9 |
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10 # if _MSC_VER+0 >= 1020 |
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11 # pragma once |
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12 # endif |
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13 |
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14 # include <boost/config.hpp> |
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15 |
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16 namespace boost { namespace python { |
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17 |
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18 template<class T> struct other |
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19 { |
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20 typedef T type; |
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21 }; |
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22 |
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23 # ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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24 namespace detail |
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25 { |
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26 template<typename T> |
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27 class is_other |
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28 { |
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29 public: |
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30 BOOST_STATIC_CONSTANT(bool, value = false); |
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31 }; |
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32 |
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33 template<typename T> |
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34 class is_other<other<T> > |
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35 { |
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36 public: |
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37 BOOST_STATIC_CONSTANT(bool, value = true); |
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38 }; |
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39 |
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40 template<typename T> |
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41 class unwrap_other |
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42 { |
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43 public: |
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44 typedef T type; |
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45 }; |
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46 |
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47 template<typename T> |
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48 class unwrap_other<other<T> > |
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49 { |
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50 public: |
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51 typedef T type; |
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52 }; |
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53 } |
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54 # else // no partial specialization |
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55 |
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56 }} // namespace boost::python |
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57 |
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58 #include <boost/type.hpp> |
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59 |
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60 namespace boost { namespace python { |
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61 |
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62 namespace detail |
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63 { |
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64 typedef char (&yes_other_t)[1]; |
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65 typedef char (&no_other_t)[2]; |
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66 |
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67 no_other_t is_other_test(...); |
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68 |
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69 template<typename T> |
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70 yes_other_t is_other_test(type< other<T> >); |
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71 |
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72 template<bool wrapped> |
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73 struct other_unwrapper |
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74 { |
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75 template <class T> |
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76 struct apply |
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77 { |
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78 typedef T type; |
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79 }; |
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80 }; |
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81 |
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82 template<> |
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83 struct other_unwrapper<true> |
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84 { |
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85 template <class T> |
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86 struct apply |
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87 { |
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88 typedef typename T::type type; |
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89 }; |
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90 }; |
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91 |
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92 template<typename T> |
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93 class is_other |
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94 { |
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95 public: |
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96 BOOST_STATIC_CONSTANT( |
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97 bool, value = ( |
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98 sizeof(detail::is_other_test(type<T>())) |
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99 == sizeof(detail::yes_other_t))); |
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100 }; |
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101 |
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102 template <typename T> |
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103 class unwrap_other |
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104 : public detail::other_unwrapper< |
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105 is_other<T>::value |
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106 >::template apply<T> |
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107 {}; |
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108 } |
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109 |
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110 # endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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111 |
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112 }} // namespace boost::python |
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113 |
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114 #endif // #ifndef OTHER_DWA20020601_HPP |