1 | |
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2 | #ifndef BOOST_MPL_ASSERT_HPP_INCLUDED |
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3 | #define BOOST_MPL_ASSERT_HPP_INCLUDED |
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4 | |
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5 | // Copyright Aleksey Gurtovoy 2000-2006 |
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6 | // |
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7 | // Distributed under the Boost Software License, Version 1.0. |
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8 | // (See accompanying file LICENSE_1_0.txt or copy at |
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9 | // http://www.boost.org/LICENSE_1_0.txt) |
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10 | // |
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11 | // See http://www.boost.org/libs/mpl for documentation. |
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12 | |
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13 | // $Id: assert.hpp 49267 2008-10-11 06:19:02Z agurtovoy $ |
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14 | // $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $ |
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15 | // $Revision: 49267 $ |
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16 | |
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17 | #include <boost/mpl/not.hpp> |
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18 | #include <boost/mpl/aux_/value_wknd.hpp> |
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19 | #include <boost/mpl/aux_/nested_type_wknd.hpp> |
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20 | #include <boost/mpl/aux_/yes_no.hpp> |
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21 | #include <boost/mpl/aux_/na.hpp> |
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22 | #include <boost/mpl/aux_/adl_barrier.hpp> |
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23 | |
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24 | #include <boost/mpl/aux_/config/nttp.hpp> |
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25 | #include <boost/mpl/aux_/config/dtp.hpp> |
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26 | #include <boost/mpl/aux_/config/gcc.hpp> |
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27 | #include <boost/mpl/aux_/config/msvc.hpp> |
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28 | #include <boost/mpl/aux_/config/static_constant.hpp> |
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29 | #include <boost/mpl/aux_/config/pp_counter.hpp> |
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30 | #include <boost/mpl/aux_/config/workaround.hpp> |
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31 | |
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32 | #include <boost/preprocessor/cat.hpp> |
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33 | |
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34 | #include <boost/config.hpp> // make sure 'size_t' is placed into 'std' |
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35 | #include <cstddef> |
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36 | |
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37 | |
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38 | #if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x610)) \ |
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39 | || (BOOST_MPL_CFG_GCC != 0) \ |
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40 | || BOOST_WORKAROUND(__IBMCPP__, <= 600) |
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41 | # define BOOST_MPL_CFG_ASSERT_USE_RELATION_NAMES |
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42 | #endif |
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43 | |
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44 | #if BOOST_WORKAROUND(__MWERKS__, < 0x3202) \ |
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45 | || BOOST_WORKAROUND(__EDG_VERSION__, <= 238) \ |
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46 | || BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x610)) \ |
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47 | || BOOST_WORKAROUND(__DMC__, BOOST_TESTED_AT(0x840)) |
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48 | # define BOOST_MPL_CFG_ASSERT_BROKEN_POINTER_TO_POINTER_TO_MEMBER |
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49 | #endif |
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50 | |
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51 | // agurt, 10/nov/06: use enums for Borland (which cannot cope with static constants) |
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52 | // and GCC (which issues "unused variable" warnings when static constants are used |
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53 | // at a function scope) |
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54 | #if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x610)) \ |
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55 | || (BOOST_MPL_CFG_GCC != 0) |
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56 | # define BOOST_MPL_AUX_ASSERT_CONSTANT(T, expr) enum { expr } |
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57 | #else |
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58 | # define BOOST_MPL_AUX_ASSERT_CONSTANT(T, expr) BOOST_STATIC_CONSTANT(T, expr) |
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59 | #endif |
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60 | |
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61 | |
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62 | BOOST_MPL_AUX_ADL_BARRIER_NAMESPACE_OPEN |
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63 | |
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64 | struct failed {}; |
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65 | |
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66 | // agurt, 24/aug/04: MSVC 7.1 workaround here and below: return/accept |
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67 | // 'assert<false>' by reference; can't apply it unconditionally -- apparently it |
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68 | // degrades the quality of GCC diagnostics |
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69 | #if BOOST_WORKAROUND(BOOST_MSVC, == 1310) |
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70 | # define AUX778076_ASSERT_ARG(x) x& |
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71 | #else |
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72 | # define AUX778076_ASSERT_ARG(x) x |
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73 | #endif |
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74 | |
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75 | template< bool C > struct assert { typedef void* type; }; |
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76 | template<> struct assert<false> { typedef AUX778076_ASSERT_ARG(assert) type; }; |
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77 | |
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78 | template< bool C > |
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79 | int assertion_failed( typename assert<C>::type ); |
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80 | |
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81 | template< bool C > |
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82 | struct assertion |
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83 | { |
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84 | static int failed( assert<false> ); |
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85 | }; |
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86 | |
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87 | template<> |
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88 | struct assertion<true> |
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89 | { |
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90 | static int failed( void* ); |
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91 | }; |
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92 | |
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93 | struct assert_ |
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94 | { |
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95 | #if !defined(BOOST_MPL_CFG_NO_DEFAULT_PARAMETERS_IN_NESTED_TEMPLATES) |
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96 | template< typename T1, typename T2 = na, typename T3 = na, typename T4 = na > struct types {}; |
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97 | #endif |
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98 | static assert_ const arg; |
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99 | enum relations { equal = 1, not_equal, greater, greater_equal, less, less_equal }; |
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100 | }; |
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101 | |
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102 | |
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103 | #if !defined(BOOST_MPL_CFG_ASSERT_USE_RELATION_NAMES) |
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104 | |
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105 | bool operator==( failed, failed ); |
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106 | bool operator!=( failed, failed ); |
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107 | bool operator>( failed, failed ); |
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108 | bool operator>=( failed, failed ); |
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109 | bool operator<( failed, failed ); |
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110 | bool operator<=( failed, failed ); |
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111 | |
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112 | #if defined(__EDG_VERSION__) |
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113 | template< bool (*)(failed, failed), long x, long y > struct assert_relation {}; |
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114 | # define BOOST_MPL_AUX_ASSERT_RELATION(x, y, r) assert_relation<r,x,y> |
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115 | #else |
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116 | template< BOOST_MPL_AUX_NTTP_DECL(long, x), BOOST_MPL_AUX_NTTP_DECL(long, y), bool (*)(failed, failed) > |
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117 | struct assert_relation {}; |
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118 | # define BOOST_MPL_AUX_ASSERT_RELATION(x, y, r) assert_relation<x,y,r> |
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119 | #endif |
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120 | |
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121 | #else // BOOST_MPL_CFG_ASSERT_USE_RELATION_NAMES |
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122 | |
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123 | boost::mpl::aux::weighted_tag<1>::type operator==( assert_, assert_ ); |
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124 | boost::mpl::aux::weighted_tag<2>::type operator!=( assert_, assert_ ); |
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125 | boost::mpl::aux::weighted_tag<3>::type operator>( assert_, assert_ ); |
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126 | boost::mpl::aux::weighted_tag<4>::type operator>=( assert_, assert_ ); |
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127 | boost::mpl::aux::weighted_tag<5>::type operator<( assert_, assert_ ); |
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128 | boost::mpl::aux::weighted_tag<6>::type operator<=( assert_, assert_ ); |
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129 | |
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130 | template< assert_::relations r, long x, long y > struct assert_relation {}; |
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131 | |
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132 | #endif |
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133 | |
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134 | |
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135 | #if !defined(BOOST_MPL_CFG_ASSERT_BROKEN_POINTER_TO_POINTER_TO_MEMBER) |
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136 | |
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137 | template< bool > struct assert_arg_pred_impl { typedef int type; }; |
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138 | template<> struct assert_arg_pred_impl<true> { typedef void* type; }; |
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139 | |
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140 | template< typename P > struct assert_arg_pred |
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141 | { |
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142 | typedef typename P::type p_type; |
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143 | typedef typename assert_arg_pred_impl< p_type::value >::type type; |
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144 | }; |
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145 | |
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146 | template< typename P > struct assert_arg_pred_not |
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147 | { |
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148 | typedef typename P::type p_type; |
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149 | BOOST_MPL_AUX_ASSERT_CONSTANT( bool, p = !p_type::value ); |
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150 | typedef typename assert_arg_pred_impl<p>::type type; |
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151 | }; |
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152 | |
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153 | template< typename Pred > |
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154 | failed ************ (Pred::************ |
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155 | assert_arg( void (*)(Pred), typename assert_arg_pred<Pred>::type ) |
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156 | ); |
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157 | |
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158 | template< typename Pred > |
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159 | failed ************ (boost::mpl::not_<Pred>::************ |
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160 | assert_not_arg( void (*)(Pred), typename assert_arg_pred_not<Pred>::type ) |
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161 | ); |
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162 | |
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163 | template< typename Pred > |
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164 | AUX778076_ASSERT_ARG(assert<false>) |
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165 | assert_arg( void (*)(Pred), typename assert_arg_pred_not<Pred>::type ); |
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166 | |
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167 | template< typename Pred > |
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168 | AUX778076_ASSERT_ARG(assert<false>) |
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169 | assert_not_arg( void (*)(Pred), typename assert_arg_pred<Pred>::type ); |
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170 | |
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171 | |
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172 | #else // BOOST_MPL_CFG_ASSERT_BROKEN_POINTER_TO_POINTER_TO_MEMBER |
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173 | |
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174 | template< bool c, typename Pred > struct assert_arg_type_impl |
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175 | { |
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176 | typedef failed ************ Pred::* mwcw83_wknd; |
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177 | typedef mwcw83_wknd ************* type; |
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178 | }; |
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179 | |
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180 | template< typename Pred > struct assert_arg_type_impl<true,Pred> |
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181 | { |
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182 | typedef AUX778076_ASSERT_ARG(assert<false>) type; |
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183 | }; |
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184 | |
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185 | template< typename Pred > struct assert_arg_type |
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186 | : assert_arg_type_impl< BOOST_MPL_AUX_VALUE_WKND(BOOST_MPL_AUX_NESTED_TYPE_WKND(Pred))::value, Pred > |
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187 | { |
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188 | }; |
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189 | |
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190 | template< typename Pred > |
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191 | typename assert_arg_type<Pred>::type |
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192 | assert_arg(void (*)(Pred), int); |
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193 | |
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194 | template< typename Pred > |
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195 | typename assert_arg_type< boost::mpl::not_<Pred> >::type |
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196 | assert_not_arg(void (*)(Pred), int); |
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197 | |
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198 | # if !defined(BOOST_MPL_CFG_ASSERT_USE_RELATION_NAMES) |
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199 | template< long x, long y, bool (*r)(failed, failed) > |
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200 | typename assert_arg_type_impl< false,BOOST_MPL_AUX_ASSERT_RELATION(x,y,r) >::type |
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201 | assert_rel_arg( BOOST_MPL_AUX_ASSERT_RELATION(x,y,r) ); |
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202 | # else |
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203 | template< assert_::relations r, long x, long y > |
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204 | typename assert_arg_type_impl< false,assert_relation<r,x,y> >::type |
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205 | assert_rel_arg( assert_relation<r,x,y> ); |
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206 | # endif |
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207 | |
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208 | #endif // BOOST_MPL_CFG_ASSERT_BROKEN_POINTER_TO_POINTER_TO_MEMBER |
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209 | |
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210 | #undef AUX778076_ASSERT_ARG |
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211 | |
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212 | BOOST_MPL_AUX_ADL_BARRIER_NAMESPACE_CLOSE |
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213 | |
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214 | |
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215 | // BOOST_MPL_ASSERT((pred<x,...>)) |
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216 | |
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217 | #define BOOST_MPL_ASSERT(pred) \ |
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218 | BOOST_MPL_AUX_ASSERT_CONSTANT( \ |
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219 | std::size_t \ |
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220 | , BOOST_PP_CAT(mpl_assertion_in_line_,BOOST_MPL_AUX_PP_COUNTER()) = sizeof( \ |
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221 | boost::mpl::assertion_failed<false>( \ |
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222 | boost::mpl::assert_arg( (void (*) pred)0, 1 ) \ |
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223 | ) \ |
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224 | ) \ |
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225 | ) \ |
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226 | /**/ |
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227 | |
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228 | // BOOST_MPL_ASSERT_NOT((pred<x,...>)) |
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229 | |
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230 | #if BOOST_WORKAROUND(BOOST_MSVC, <= 1300) |
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231 | # define BOOST_MPL_ASSERT_NOT(pred) \ |
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232 | enum { \ |
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233 | BOOST_PP_CAT(mpl_assertion_in_line_,BOOST_MPL_AUX_PP_COUNTER()) = sizeof( \ |
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234 | boost::mpl::assertion<false>::failed( \ |
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235 | boost::mpl::assert_not_arg( (void (*) pred)0, 1 ) \ |
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236 | ) \ |
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237 | ) \ |
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238 | }\ |
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239 | /**/ |
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240 | #else |
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241 | # define BOOST_MPL_ASSERT_NOT(pred) \ |
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242 | BOOST_MPL_AUX_ASSERT_CONSTANT( \ |
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243 | std::size_t \ |
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244 | , BOOST_PP_CAT(mpl_assertion_in_line_,BOOST_MPL_AUX_PP_COUNTER()) = sizeof( \ |
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245 | boost::mpl::assertion_failed<false>( \ |
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246 | boost::mpl::assert_not_arg( (void (*) pred)0, 1 ) \ |
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247 | ) \ |
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248 | ) \ |
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249 | ) \ |
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250 | /**/ |
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251 | #endif |
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252 | |
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253 | // BOOST_MPL_ASSERT_RELATION(x, ==|!=|<=|<|>=|>, y) |
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254 | |
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255 | #if defined(BOOST_MPL_CFG_ASSERT_USE_RELATION_NAMES) |
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256 | |
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257 | # if !defined(BOOST_MPL_CFG_ASSERT_BROKEN_POINTER_TO_POINTER_TO_MEMBER) |
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258 | // agurt, 9/nov/06: 'enum' below is a workaround for gcc 4.0.4/4.1.1 bugs #29522 and #29518 |
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259 | # define BOOST_MPL_ASSERT_RELATION_IMPL(counter, x, rel, y) \ |
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260 | enum { BOOST_PP_CAT(mpl_assert_rel_value,counter) = (x rel y) }; \ |
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261 | BOOST_MPL_AUX_ASSERT_CONSTANT( \ |
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262 | std::size_t \ |
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263 | , BOOST_PP_CAT(mpl_assertion_in_line_,counter) = sizeof( \ |
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264 | boost::mpl::assertion_failed<BOOST_PP_CAT(mpl_assert_rel_value,counter)>( \ |
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265 | (boost::mpl::failed ************ ( boost::mpl::assert_relation< \ |
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266 | boost::mpl::assert_::relations( sizeof( \ |
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267 | boost::mpl::assert_::arg rel boost::mpl::assert_::arg \ |
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268 | ) ) \ |
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269 | , x \ |
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270 | , y \ |
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271 | >::************)) 0 ) \ |
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272 | ) \ |
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273 | ) \ |
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274 | /**/ |
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275 | # else |
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276 | # define BOOST_MPL_ASSERT_RELATION_IMPL(counter, x, rel, y) \ |
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277 | BOOST_MPL_AUX_ASSERT_CONSTANT( \ |
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278 | std::size_t \ |
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279 | , BOOST_PP_CAT(mpl_assert_rel,counter) = sizeof( \ |
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280 | boost::mpl::assert_::arg rel boost::mpl::assert_::arg \ |
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281 | ) \ |
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282 | ); \ |
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283 | BOOST_MPL_AUX_ASSERT_CONSTANT( bool, BOOST_PP_CAT(mpl_assert_rel_value,counter) = (x rel y) ); \ |
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284 | BOOST_MPL_AUX_ASSERT_CONSTANT( \ |
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285 | std::size_t \ |
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286 | , BOOST_PP_CAT(mpl_assertion_in_line_,counter) = sizeof( \ |
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287 | boost::mpl::assertion_failed<BOOST_PP_CAT(mpl_assert_rel_value,counter)>( \ |
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288 | boost::mpl::assert_rel_arg( boost::mpl::assert_relation< \ |
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289 | boost::mpl::assert_::relations(BOOST_PP_CAT(mpl_assert_rel,counter)) \ |
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290 | , x \ |
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291 | , y \ |
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292 | >() ) \ |
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293 | ) \ |
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294 | ) \ |
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295 | ) \ |
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296 | /**/ |
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297 | # endif |
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298 | |
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299 | # define BOOST_MPL_ASSERT_RELATION(x, rel, y) \ |
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300 | BOOST_MPL_ASSERT_RELATION_IMPL(BOOST_MPL_AUX_PP_COUNTER(), x, rel, y) \ |
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301 | /**/ |
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302 | |
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303 | #else // !BOOST_MPL_CFG_ASSERT_USE_RELATION_NAMES |
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304 | |
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305 | # if defined(BOOST_MPL_CFG_ASSERT_BROKEN_POINTER_TO_POINTER_TO_MEMBER) |
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306 | # define BOOST_MPL_ASSERT_RELATION(x, rel, y) \ |
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307 | BOOST_MPL_AUX_ASSERT_CONSTANT( \ |
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308 | std::size_t \ |
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309 | , BOOST_PP_CAT(mpl_assertion_in_line_,BOOST_MPL_AUX_PP_COUNTER()) = sizeof( \ |
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310 | boost::mpl::assertion_failed<(x rel y)>( boost::mpl::assert_rel_arg( \ |
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311 | boost::mpl::BOOST_MPL_AUX_ASSERT_RELATION(x,y,(&boost::mpl::operator rel))() \ |
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312 | ) ) \ |
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313 | ) \ |
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314 | ) \ |
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315 | /**/ |
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316 | # else |
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317 | # define BOOST_MPL_ASSERT_RELATION(x, rel, y) \ |
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318 | BOOST_MPL_AUX_ASSERT_CONSTANT( \ |
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319 | std::size_t \ |
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320 | , BOOST_PP_CAT(mpl_assertion_in_line_,BOOST_MPL_AUX_PP_COUNTER()) = sizeof( \ |
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321 | boost::mpl::assertion_failed<(x rel y)>( (boost::mpl::failed ************ ( \ |
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322 | boost::mpl::BOOST_MPL_AUX_ASSERT_RELATION(x,y,(&boost::mpl::operator rel))::************))0 ) \ |
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323 | ) \ |
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324 | ) \ |
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325 | /**/ |
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326 | # endif |
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327 | |
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328 | #endif |
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329 | |
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330 | |
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331 | // BOOST_MPL_ASSERT_MSG( (pred<x,...>::value), USER_PROVIDED_MESSAGE, (types<x,...>) ) |
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332 | |
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333 | #if BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3202)) |
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334 | # define BOOST_MPL_ASSERT_MSG_IMPL( counter, c, msg, types_ ) \ |
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335 | struct msg; \ |
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336 | typedef struct BOOST_PP_CAT(msg,counter) : boost::mpl::assert_ \ |
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337 | { \ |
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338 | using boost::mpl::assert_::types; \ |
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339 | static boost::mpl::failed ************ (msg::************ assert_arg()) types_ \ |
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340 | { return 0; } \ |
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341 | } BOOST_PP_CAT(mpl_assert_arg,counter); \ |
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342 | BOOST_MPL_AUX_ASSERT_CONSTANT( \ |
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343 | std::size_t \ |
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344 | , BOOST_PP_CAT(mpl_assertion_in_line_,counter) = sizeof( \ |
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345 | boost::mpl::assertion<(c)>::failed( BOOST_PP_CAT(mpl_assert_arg,counter)::assert_arg() ) \ |
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346 | ) \ |
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347 | ) \ |
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348 | /**/ |
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349 | #else |
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350 | # define BOOST_MPL_ASSERT_MSG_IMPL( counter, c, msg, types_ ) \ |
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351 | struct msg; \ |
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352 | typedef struct BOOST_PP_CAT(msg,counter) : boost::mpl::assert_ \ |
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353 | { \ |
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354 | static boost::mpl::failed ************ (msg::************ assert_arg()) types_ \ |
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355 | { return 0; } \ |
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356 | } BOOST_PP_CAT(mpl_assert_arg,counter); \ |
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357 | BOOST_MPL_AUX_ASSERT_CONSTANT( \ |
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358 | std::size_t \ |
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359 | , BOOST_PP_CAT(mpl_assertion_in_line_,counter) = sizeof( \ |
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360 | boost::mpl::assertion_failed<(c)>( BOOST_PP_CAT(mpl_assert_arg,counter)::assert_arg() ) \ |
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361 | ) \ |
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362 | ) \ |
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363 | /**/ |
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364 | #endif |
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365 | |
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366 | #define BOOST_MPL_ASSERT_MSG( c, msg, types_ ) \ |
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367 | BOOST_MPL_ASSERT_MSG_IMPL( BOOST_MPL_AUX_PP_COUNTER(), c, msg, types_ ) \ |
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368 | /**/ |
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369 | |
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370 | #endif // BOOST_MPL_ASSERT_HPP_INCLUDED |
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