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1 // (C) Copyright John Maddock 2005. |
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2 // Use, modification and distribution are subject to the |
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3 // Boost Software License, Version 1.0. (See accompanying file |
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4 // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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5 |
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6 #ifndef BOOST_TR1_UTILITY_HPP_INCLUDED |
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7 # define BOOST_TR1_UTILITY_HPP_INCLUDED |
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8 # include <boost/tr1/detail/config.hpp> |
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9 |
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10 #ifdef BOOST_HAS_TR1_UTILITY |
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11 |
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12 # ifdef BOOST_HAS_INCLUDE_NEXT |
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13 # include_next BOOST_TR1_HEADER(utility) |
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14 # else |
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15 # include BOOST_TR1_STD_HEADER(BOOST_TR1_PATH(utility)) |
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16 # endif |
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17 |
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18 #else |
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19 |
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20 #if defined(BOOST_TR1_USE_OLD_TUPLE) |
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21 |
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22 #include <boost/type_traits/integral_constant.hpp> |
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23 #include <boost/type_traits/add_const.hpp> |
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24 #include <boost/type_traits/add_reference.hpp> |
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25 #include <boost/mpl/if.hpp> |
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26 |
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27 |
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28 namespace std{ namespace tr1{ |
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29 |
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30 template <class T> struct tuple_size; // forward declaration |
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31 template < int I, class T> struct tuple_element; // forward declaration |
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32 |
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33 #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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34 template <class T1, class T2> |
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35 struct tuple_size< ::std::pair<T1, T2> > |
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36 : public ::boost::integral_constant< ::std::size_t, 2> |
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37 { |
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38 }; |
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39 |
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40 template <class T1, class T2> |
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41 struct tuple_element<0, ::std::pair<T1, T2> > |
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42 { |
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43 typedef typename std::pair<T1, T2>::first_type type; |
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44 }; |
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45 |
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46 template <class T1, class T2> |
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47 struct tuple_element<1, std::pair<T1, T2> > |
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48 { |
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49 typedef typename std::pair<T1, T2>::second_type type; |
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50 }; |
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51 #endif |
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52 |
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53 namespace tuple_detail{ |
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54 template <int I, class T1, class T2> |
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55 struct tuple_get_result |
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56 { |
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57 typedef typename boost::mpl::if_c<I==0, T1, T2>::type t1; |
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58 typedef typename boost::add_reference<t1>::type type; |
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59 }; |
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60 template <int I, class T1, class T2> |
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61 struct const_tuple_get_result |
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62 { |
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63 typedef typename boost::mpl::if_c<I==0, T1, T2>::type t1; |
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64 # if BOOST_WORKAROUND( __BORLANDC__, BOOST_TESTED_AT( 0x582)) |
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65 // I have absolutely no idea why add_const is not working here for Borland! |
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66 // It passes all other free-standing tests, some strange interaction going on |
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67 typedef typename boost::add_reference< const t1 >::type type; |
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68 # else |
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69 typedef typename boost::add_const<t1>::type t2; |
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70 typedef typename boost::add_reference<t2>::type type; |
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71 # endif |
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72 }; |
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73 |
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74 template<int I, class T1, class T2> |
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75 inline typename tuple_detail::tuple_get_result<I,T1,T2>::type get(std::pair<T1, T2>& p, const ::boost::true_type&) |
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76 { |
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77 return p.first; |
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78 } |
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79 |
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80 template<int I, class T1, class T2> |
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81 inline typename tuple_detail::const_tuple_get_result<I,T1,T2>::type get(const std::pair<T1, T2>& p, const ::boost::true_type&) |
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82 { |
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83 return p.first; |
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84 } |
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85 |
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86 template<int I, class T1, class T2> |
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87 inline typename tuple_detail::tuple_get_result<I,T1,T2>::type get(std::pair<T1, T2>& p, const ::boost::false_type&) |
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88 { |
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89 return p.second; |
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90 } |
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91 |
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92 template<int I, class T1, class T2> |
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93 inline typename tuple_detail::const_tuple_get_result<I,T1,T2>::type get(const std::pair<T1, T2>& p, const ::boost::false_type&) |
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94 { |
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95 return p.second; |
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96 } |
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97 |
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98 } |
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99 |
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100 template<int I, class T1, class T2> |
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101 inline typename tuple_detail::tuple_get_result<I,T1,T2>::type get(std::pair<T1, T2>& p) |
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102 { |
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103 return tuple_detail::get<I>(p, boost::integral_constant<bool, I==0>()); |
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104 } |
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105 |
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106 template<int I, class T1, class T2> |
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107 inline typename tuple_detail::const_tuple_get_result<I,T1,T2>::type get(const std::pair<T1, T2>& p) |
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108 { |
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109 return tuple_detail::get<I>(p, boost::integral_constant<bool, I==0>()); |
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110 } |
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111 |
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112 } } // namespaces |
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113 |
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114 #else |
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115 |
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116 #include <boost/tr1/tuple.hpp> |
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117 |
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118 #endif |
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119 |
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120 #endif |
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121 |
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122 #endif |