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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 |