1 | // Copyright David Abrahams and Aleksey Gurtovoy |
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2 | // 2002-2004. Distributed under the Boost Software License, Version |
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3 | // 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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4 | // http://www.boost.org/LICENSE_1_0.txt) |
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5 | |
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6 | // compile-time test for "boost/ref.hpp" header content |
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7 | // see 'ref_test.cpp' for run-time part |
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8 | |
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9 | #include <boost/ref.hpp> |
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10 | #include <boost/type_traits/is_same.hpp> |
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11 | #include <boost/type_traits/remove_const.hpp> |
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12 | #include <boost/static_assert.hpp> |
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13 | #include <boost/detail/workaround.hpp> |
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14 | |
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15 | #include <boost/mpl/assert.hpp> |
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16 | |
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17 | namespace { |
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18 | |
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19 | template< typename T, typename U > |
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20 | void ref_test(boost::reference_wrapper<U>) |
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21 | { |
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22 | typedef typename boost::reference_wrapper<U>::type type; |
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23 | BOOST_STATIC_ASSERT((boost::is_same<U,type>::value)); |
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24 | BOOST_STATIC_ASSERT((boost::is_same<T,type>::value)); |
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25 | } |
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26 | |
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27 | template< typename T > |
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28 | void assignable_test(T x) |
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29 | { |
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30 | x = x; |
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31 | } |
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32 | |
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33 | template< bool R, typename T > |
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34 | void is_reference_wrapper_test(T) |
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35 | { |
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36 | BOOST_STATIC_ASSERT(boost::is_reference_wrapper<T>::value == R); |
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37 | } |
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38 | |
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39 | template< typename R, typename Ref > |
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40 | void cxx_reference_test(Ref) |
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41 | { |
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42 | #if BOOST_WORKAROUND(__BORLANDC__, < 0x600) |
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43 | typedef typename boost::remove_const<Ref>::type ref; |
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44 | BOOST_STATIC_ASSERT((boost::is_same<R,ref>::value)); |
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45 | #else |
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46 | BOOST_STATIC_ASSERT((boost::is_same<R,Ref>::value)); |
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47 | #endif |
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48 | } |
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49 | |
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50 | template< typename R, typename Ref > |
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51 | void unwrap_reference_test(Ref) |
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52 | { |
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53 | #if BOOST_WORKAROUND(__BORLANDC__, < 0x600) |
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54 | typedef typename boost::remove_const<Ref>::type ref; |
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55 | typedef typename boost::unwrap_reference<ref>::type type; |
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56 | #else |
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57 | typedef typename boost::unwrap_reference<Ref>::type type; |
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58 | #endif |
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59 | BOOST_STATIC_ASSERT((boost::is_same<R,type>::value)); |
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60 | } |
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61 | |
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62 | } // namespace |
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63 | |
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64 | int main() |
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65 | { |
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66 | int i = 0; |
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67 | int& ri = i; |
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68 | |
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69 | int const ci = 0; |
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70 | int const& rci = ci; |
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71 | |
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72 | // 'ref/cref' functions test |
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73 | ref_test<int>(boost::ref(i)); |
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74 | ref_test<int>(boost::ref(ri)); |
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75 | ref_test<int const>(boost::ref(ci)); |
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76 | ref_test<int const>(boost::ref(rci)); |
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77 | |
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78 | ref_test<int const>(boost::cref(i)); |
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79 | ref_test<int const>(boost::cref(ri)); |
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80 | ref_test<int const>(boost::cref(ci)); |
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81 | ref_test<int const>(boost::cref(rci)); |
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82 | |
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83 | // test 'assignable' requirement |
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84 | assignable_test(boost::ref(i)); |
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85 | assignable_test(boost::ref(ri)); |
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86 | assignable_test(boost::cref(i)); |
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87 | assignable_test(boost::cref(ci)); |
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88 | assignable_test(boost::cref(rci)); |
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89 | |
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90 | // 'is_reference_wrapper' test |
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91 | is_reference_wrapper_test<true>(boost::ref(i)); |
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92 | is_reference_wrapper_test<true>(boost::ref(ri)); |
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93 | is_reference_wrapper_test<true>(boost::cref(i)); |
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94 | is_reference_wrapper_test<true>(boost::cref(ci)); |
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95 | is_reference_wrapper_test<true>(boost::cref(rci)); |
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96 | |
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97 | is_reference_wrapper_test<false>(i); |
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98 | is_reference_wrapper_test<false, int&>(ri); |
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99 | is_reference_wrapper_test<false>(ci); |
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100 | is_reference_wrapper_test<false, int const&>(rci); |
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101 | |
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102 | // ordinary references/function template arguments deduction test |
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103 | cxx_reference_test<int>(i); |
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104 | cxx_reference_test<int>(ri); |
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105 | cxx_reference_test<int>(ci); |
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106 | cxx_reference_test<int>(rci); |
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107 | |
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108 | cxx_reference_test<int&, int&>(i); |
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109 | cxx_reference_test<int&, int&>(ri); |
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110 | cxx_reference_test<int const&, int const&>(i); |
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111 | cxx_reference_test<int const&, int const&>(ri); |
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112 | cxx_reference_test<int const&, int const&>(ci); |
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113 | cxx_reference_test<int const&, int const&>(rci); |
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114 | |
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115 | // 'unwrap_reference' test |
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116 | unwrap_reference_test<int>(boost::ref(i)); |
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117 | unwrap_reference_test<int>(boost::ref(ri)); |
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118 | unwrap_reference_test<int const>(boost::cref(i)); |
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119 | unwrap_reference_test<int const>(boost::cref(ci)); |
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120 | unwrap_reference_test<int const>(boost::cref(rci)); |
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121 | |
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122 | unwrap_reference_test<int>(i); |
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123 | unwrap_reference_test<int>(ri); |
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124 | unwrap_reference_test<int>(ci); |
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125 | unwrap_reference_test<int>(rci); |
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126 | unwrap_reference_test<int&, int&>(i); |
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127 | unwrap_reference_test<int&, int&>(ri); |
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128 | unwrap_reference_test<int const&, int const&>(i); |
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129 | unwrap_reference_test<int const&, int const&>(ri); |
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130 | unwrap_reference_test<int const&, int const&>(ci); |
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131 | unwrap_reference_test<int const&, int const&>(rci); |
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132 | |
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133 | return 0; |
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134 | } |
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