1 2 #ifndef BOOST_MPL_ASSERT_HPP_INCLUDED 3 #define BOOST_MPL_ASSERT_HPP_INCLUDED 4 5 // Copyright Aleksey Gurtovoy 2000-2006 6 // 7 // Distributed under the Boost Software License, Version 1.0. 8 // (See accompanying file LICENSE_1_0.txt or copy at 9 // http://www.boost.org/LICENSE_1_0.txt) 10 // 11 // See http://www.boost.org/libs/mpl for documentation. 12 13 // $Id: assert.hpp 49267 2008-10-11 06:19:02Z agurtovoy $ 14 // $Date: 2008-10-10 23:19:02 -0700 (Fri, 10 Oct 2008) $ 15 // $Revision: 49267 $ 16 17 #include <boost/mpl/not.hpp> 18 #include <boost/mpl/aux_/value_wknd.hpp> 19 #include <boost/mpl/aux_/nested_type_wknd.hpp> 20 #include <boost/mpl/aux_/yes_no.hpp> 21 #include <boost/mpl/aux_/na.hpp> 22 #include <boost/mpl/aux_/adl_barrier.hpp> 23 24 #include <boost/mpl/aux_/config/nttp.hpp> 25 #include <boost/mpl/aux_/config/dtp.hpp> 26 #include <boost/mpl/aux_/config/gcc.hpp> 27 #include <boost/mpl/aux_/config/msvc.hpp> 28 #include <boost/mpl/aux_/config/static_constant.hpp> 29 #include <boost/mpl/aux_/config/pp_counter.hpp> 30 #include <boost/mpl/aux_/config/workaround.hpp> 31 32 #include <boost/preprocessor/cat.hpp> 33 34 #include <boost/config.hpp> // make sure 'size_t' is placed into 'std' 35 #include <cstddef> 36 37 38 #if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x610)) \ 39 || (BOOST_MPL_CFG_GCC != 0) \ 40 || BOOST_WORKAROUND(__IBMCPP__, <= 600) 41 # define BOOST_MPL_CFG_ASSERT_USE_RELATION_NAMES 42 #endif 43 44 #if BOOST_WORKAROUND(__MWERKS__, < 0x3202) \ 45 || BOOST_WORKAROUND(__EDG_VERSION__, <= 238) \ 46 || BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x610)) \ 47 || BOOST_WORKAROUND(__DMC__, BOOST_TESTED_AT(0x840)) 48 # define BOOST_MPL_CFG_ASSERT_BROKEN_POINTER_TO_POINTER_TO_MEMBER 49 #endif 50 51 // agurt, 10/nov/06: use enums for Borland (which cannot cope with static constants) 52 // and GCC (which issues "unused variable" warnings when static constants are used 53 // at a function scope) 54 #if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x610)) \ 55 || (BOOST_MPL_CFG_GCC != 0) 56 # define BOOST_MPL_AUX_ASSERT_CONSTANT(T, expr) enum { expr } 57 #else 58 # define BOOST_MPL_AUX_ASSERT_CONSTANT(T, expr) BOOST_STATIC_CONSTANT(T, expr) 59 #endif 60 61 62 BOOST_MPL_AUX_ADL_BARRIER_NAMESPACE_OPEN 63 64 struct failed {}; 65 66 // agurt, 24/aug/04: MSVC 7.1 workaround here and below: return/accept 67 // 'assert<false>' by reference; can't apply it unconditionally -- apparently it 68 // degrades the quality of GCC diagnostics 69 #if BOOST_WORKAROUND(BOOST_MSVC, == 1310) 70 # define AUX778076_ASSERT_ARG(x) x& 71 #else 72 # define AUX778076_ASSERT_ARG(x) x 73 #endif 74 75 template< bool C > struct assert { typedef void* type; }; 76 template<> struct assert<false> { typedef AUX778076_ASSERT_ARG(assert) type; }; 77 78 template< bool C > 79 int assertion_failed( typename assert<C>::type ); 80 81 template< bool C > 82 struct assertion 83 { 84 static int failed( assert<false> ); 85 }; 86 87 template<> 88 struct assertion<true> 89 { 90 static int failed( void* ); 91 }; 92 93 struct assert_ 94 { 95 #if !defined(BOOST_MPL_CFG_NO_DEFAULT_PARAMETERS_IN_NESTED_TEMPLATES) 96 template< typename T1, typename T2 = na, typename T3 = na, typename T4 = na > struct types {}; 97 #endif 98 static assert_ const arg; 99 enum relations { equal = 1, not_equal, greater, greater_equal, less, less_equal }; 100 }; 101 102 103 #if !defined(BOOST_MPL_CFG_ASSERT_USE_RELATION_NAMES) 104 105 bool operator==( failed, failed ); 106 bool operator!=( failed, failed ); 107 bool operator>( failed, failed ); 108 bool operator>=( failed, failed ); 109 bool operator<( failed, failed ); 110 bool operator<=( failed, failed ); 111 112 #if defined(__EDG_VERSION__) 113 template< bool (*)(failed, failed), long x, long y > struct assert_relation {}; 114 # define BOOST_MPL_AUX_ASSERT_RELATION(x, y, r) assert_relation<r,x,y> 115 #else 116 template< BOOST_MPL_AUX_NTTP_DECL(long, x), BOOST_MPL_AUX_NTTP_DECL(long, y), bool (*)(failed, failed) > 117 struct assert_relation {}; 118 # define BOOST_MPL_AUX_ASSERT_RELATION(x, y, r) assert_relation<x,y,r> 119 #endif 120 121 #else // BOOST_MPL_CFG_ASSERT_USE_RELATION_NAMES 122 123 boost::mpl::aux::weighted_tag<1>::type operator==( assert_, assert_ ); 124 boost::mpl::aux::weighted_tag<2>::type operator!=( assert_, assert_ ); 125 boost::mpl::aux::weighted_tag<3>::type operator>( assert_, assert_ ); 126 boost::mpl::aux::weighted_tag<4>::type operator>=( assert_, assert_ ); 127 boost::mpl::aux::weighted_tag<5>::type operator<( assert_, assert_ ); 128 boost::mpl::aux::weighted_tag<6>::type operator<=( assert_, assert_ ); 129 130 template< assert_::relations r, long x, long y > struct assert_relation {}; 131 132 #endif 133 134 135 #if !defined(BOOST_MPL_CFG_ASSERT_BROKEN_POINTER_TO_POINTER_TO_MEMBER) 136 137 template< bool > struct assert_arg_pred_impl { typedef int type; }; 138 template<> struct assert_arg_pred_impl<true> { typedef void* type; }; 139 140 template< typename P > struct assert_arg_pred 141 { 142 typedef typename P::type p_type; 143 typedef typename assert_arg_pred_impl< p_type::value >::type type; 144 }; 145 146 template< typename P > struct assert_arg_pred_not 147 { 148 typedef typename P::type p_type; 149 BOOST_MPL_AUX_ASSERT_CONSTANT( bool, p = !p_type::value ); 150 typedef typename assert_arg_pred_impl<p>::type type; 151 }; 152 153 template< typename Pred > 154 failed ************ (Pred::************ 155 assert_arg( void (*)(Pred), typename assert_arg_pred<Pred>::type ) 156 ); 157 158 template< typename Pred > 159 failed ************ (boost::mpl::not_<Pred>::************ 160 assert_not_arg( void (*)(Pred), typename assert_arg_pred_not<Pred>::type ) 161 ); 162 163 template< typename Pred > 164 AUX778076_ASSERT_ARG(assert<false>) 165 assert_arg( void (*)(Pred), typename assert_arg_pred_not<Pred>::type ); 166 167 template< typename Pred > 168 AUX778076_ASSERT_ARG(assert<false>) 169 assert_not_arg( void (*)(Pred), typename assert_arg_pred<Pred>::type ); 170 171 172 #else // BOOST_MPL_CFG_ASSERT_BROKEN_POINTER_TO_POINTER_TO_MEMBER 173 174 template< bool c, typename Pred > struct assert_arg_type_impl 175 { 176 typedef failed ************ Pred::* mwcw83_wknd; 177 typedef mwcw83_wknd ************* type; 178 }; 179 180 template< typename Pred > struct assert_arg_type_impl<true,Pred> 181 { 182 typedef AUX778076_ASSERT_ARG(assert<false>) type; 183 }; 184 185 template< typename Pred > struct assert_arg_type 186 : assert_arg_type_impl< BOOST_MPL_AUX_VALUE_WKND(BOOST_MPL_AUX_NESTED_TYPE_WKND(Pred))::value, Pred > 187 { 188 }; 189 190 template< typename Pred > 191 typename assert_arg_type<Pred>::type 192 assert_arg(void (*)(Pred), int); 193 194 template< typename Pred > 195 typename assert_arg_type< boost::mpl::not_<Pred> >::type 196 assert_not_arg(void (*)(Pred), int); 197 198 # if !defined(BOOST_MPL_CFG_ASSERT_USE_RELATION_NAMES) 199 template< long x, long y, bool (*r)(failed, failed) > 200 typename assert_arg_type_impl< false,BOOST_MPL_AUX_ASSERT_RELATION(x,y,r) >::type 201 assert_rel_arg( BOOST_MPL_AUX_ASSERT_RELATION(x,y,r) ); 202 # else 203 template< assert_::relations r, long x, long y > 204 typename assert_arg_type_impl< false,assert_relation<r,x,y> >::type 205 assert_rel_arg( assert_relation<r,x,y> ); 206 # endif 207 208 #endif // BOOST_MPL_CFG_ASSERT_BROKEN_POINTER_TO_POINTER_TO_MEMBER 209 210 #undef AUX778076_ASSERT_ARG 211 212 BOOST_MPL_AUX_ADL_BARRIER_NAMESPACE_CLOSE 213 214 215 // BOOST_MPL_ASSERT((pred<x,...>)) 216 217 #define BOOST_MPL_ASSERT(pred) \ 218 BOOST_MPL_AUX_ASSERT_CONSTANT( \ 219 std::size_t \ 220 , BOOST_PP_CAT(mpl_assertion_in_line_,BOOST_MPL_AUX_PP_COUNTER()) = sizeof( \ 221 boost::mpl::assertion_failed<false>( \ 222 boost::mpl::assert_arg( (void (*) pred)0, 1 ) \ 223 ) \ 224 ) \ 225 ) \ 226 /**/ 227 228 // BOOST_MPL_ASSERT_NOT((pred<x,...>)) 229 230 #if BOOST_WORKAROUND(BOOST_MSVC, <= 1300) 231 # define BOOST_MPL_ASSERT_NOT(pred) \ 232 enum { \ 233 BOOST_PP_CAT(mpl_assertion_in_line_,BOOST_MPL_AUX_PP_COUNTER()) = sizeof( \ 234 boost::mpl::assertion<false>::failed( \ 235 boost::mpl::assert_not_arg( (void (*) pred)0, 1 ) \ 236 ) \ 237 ) \ 238 }\ 239 /**/ 240 #else 241 # define BOOST_MPL_ASSERT_NOT(pred) \ 242 BOOST_MPL_AUX_ASSERT_CONSTANT( \ 243 std::size_t \ 244 , BOOST_PP_CAT(mpl_assertion_in_line_,BOOST_MPL_AUX_PP_COUNTER()) = sizeof( \ 245 boost::mpl::assertion_failed<false>( \ 246 boost::mpl::assert_not_arg( (void (*) pred)0, 1 ) \ 247 ) \ 248 ) \ 249 ) \ 250 /**/ 251 #endif 252 253 // BOOST_MPL_ASSERT_RELATION(x, ==|!=|<=|<|>=|>, y) 254 255 #if defined(BOOST_MPL_CFG_ASSERT_USE_RELATION_NAMES) 256 257 # if !defined(BOOST_MPL_CFG_ASSERT_BROKEN_POINTER_TO_POINTER_TO_MEMBER) 258 // agurt, 9/nov/06: 'enum' below is a workaround for gcc 4.0.4/4.1.1 bugs #29522 and #29518 259 # define BOOST_MPL_ASSERT_RELATION_IMPL(counter, x, rel, y) \ 260 enum { BOOST_PP_CAT(mpl_assert_rel_value,counter) = (x rel y) }; \ 261 BOOST_MPL_AUX_ASSERT_CONSTANT( \ 262 std::size_t \ 263 , BOOST_PP_CAT(mpl_assertion_in_line_,counter) = sizeof( \ 264 boost::mpl::assertion_failed<BOOST_PP_CAT(mpl_assert_rel_value,counter)>( \ 265 (boost::mpl::failed ************ ( boost::mpl::assert_relation< \ 266 boost::mpl::assert_::relations( sizeof( \ 267 boost::mpl::assert_::arg rel boost::mpl::assert_::arg \ 268 ) ) \ 269 , x \ 270 , y \ 271 >::************)) 0 ) \ 272 ) \ 273 ) \ 274 /**/ 275 # else 276 # define BOOST_MPL_ASSERT_RELATION_IMPL(counter, x, rel, y) \ 277 BOOST_MPL_AUX_ASSERT_CONSTANT( \ 278 std::size_t \ 279 , BOOST_PP_CAT(mpl_assert_rel,counter) = sizeof( \ 280 boost::mpl::assert_::arg rel boost::mpl::assert_::arg \ 281 ) \ 282 ); \ 283 BOOST_MPL_AUX_ASSERT_CONSTANT( bool, BOOST_PP_CAT(mpl_assert_rel_value,counter) = (x rel y) ); \ 284 BOOST_MPL_AUX_ASSERT_CONSTANT( \ 285 std::size_t \ 286 , BOOST_PP_CAT(mpl_assertion_in_line_,counter) = sizeof( \ 287 boost::mpl::assertion_failed<BOOST_PP_CAT(mpl_assert_rel_value,counter)>( \ 288 boost::mpl::assert_rel_arg( boost::mpl::assert_relation< \ 289 boost::mpl::assert_::relations(BOOST_PP_CAT(mpl_assert_rel,counter)) \ 290 , x \ 291 , y \ 292 >() ) \ 293 ) \ 294 ) \ 295 ) \ 296 /**/ 297 # endif 298 299 # define BOOST_MPL_ASSERT_RELATION(x, rel, y) \ 300 BOOST_MPL_ASSERT_RELATION_IMPL(BOOST_MPL_AUX_PP_COUNTER(), x, rel, y) \ 301 /**/ 302 303 #else // !BOOST_MPL_CFG_ASSERT_USE_RELATION_NAMES 304 305 # if defined(BOOST_MPL_CFG_ASSERT_BROKEN_POINTER_TO_POINTER_TO_MEMBER) 306 # define BOOST_MPL_ASSERT_RELATION(x, rel, y) \ 307 BOOST_MPL_AUX_ASSERT_CONSTANT( \ 308 std::size_t \ 309 , BOOST_PP_CAT(mpl_assertion_in_line_,BOOST_MPL_AUX_PP_COUNTER()) = sizeof( \ 310 boost::mpl::assertion_failed<(x rel y)>( boost::mpl::assert_rel_arg( \ 311 boost::mpl::BOOST_MPL_AUX_ASSERT_RELATION(x,y,(&boost::mpl::operator rel))() \ 312 ) ) \ 313 ) \ 314 ) \ 315 /**/ 316 # else 317 # define BOOST_MPL_ASSERT_RELATION(x, rel, y) \ 318 BOOST_MPL_AUX_ASSERT_CONSTANT( \ 319 std::size_t \ 320 , BOOST_PP_CAT(mpl_assertion_in_line_,BOOST_MPL_AUX_PP_COUNTER()) = sizeof( \ 321 boost::mpl::assertion_failed<(x rel y)>( (boost::mpl::failed ************ ( \ 322 boost::mpl::BOOST_MPL_AUX_ASSERT_RELATION(x,y,(&boost::mpl::operator rel))::************))0 ) \ 323 ) \ 324 ) \ 325 /**/ 326 # endif 327 328 #endif 329 330 331 // BOOST_MPL_ASSERT_MSG( (pred<x,...>::value), USER_PROVIDED_MESSAGE, (types<x,...>) ) 332 333 #if BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3202)) 334 # define BOOST_MPL_ASSERT_MSG_IMPL( counter, c, msg, types_ ) \ 335 struct msg; \ 336 typedef struct BOOST_PP_CAT(msg,counter) : boost::mpl::assert_ \ 337 { \ 338 using boost::mpl::assert_::types; \ 339 static boost::mpl::failed ************ (msg::************ assert_arg()) types_ \ 340 { return 0; } \ 341 } BOOST_PP_CAT(mpl_assert_arg,counter); \ 342 BOOST_MPL_AUX_ASSERT_CONSTANT( \ 343 std::size_t \ 344 , BOOST_PP_CAT(mpl_assertion_in_line_,counter) = sizeof( \ 345 boost::mpl::assertion<(c)>::failed( BOOST_PP_CAT(mpl_assert_arg,counter)::assert_arg() ) \ 346 ) \ 347 ) \ 348 /**/ 349 #else 350 # define BOOST_MPL_ASSERT_MSG_IMPL( counter, c, msg, types_ ) \ 351 struct msg; \ 352 typedef struct BOOST_PP_CAT(msg,counter) : boost::mpl::assert_ \ 353 { \ 354 static boost::mpl::failed ************ (msg::************ assert_arg()) types_ \ 355 { return 0; } \ 356 } BOOST_PP_CAT(mpl_assert_arg,counter); \ 357 BOOST_MPL_AUX_ASSERT_CONSTANT( \ 358 std::size_t \ 359 , BOOST_PP_CAT(mpl_assertion_in_line_,counter) = sizeof( \ 360 boost::mpl::assertion_failed<(c)>( BOOST_PP_CAT(mpl_assert_arg,counter)::assert_arg() ) \ 361 ) \ 362 ) \ 363 /**/ 364 #endif 365 366 #define BOOST_MPL_ASSERT_MSG( c, msg, types_ ) \ 367 BOOST_MPL_ASSERT_MSG_IMPL( BOOST_MPL_AUX_PP_COUNTER(), c, msg, types_ ) \ 368 /**/ 369 370 #endif // BOOST_MPL_ASSERT_HPP_INCLUDED 371
