ceph/src/boost/libs/mpl/include/boost/mpl/assert.hpp

   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 // $Id$
  14 // $Date$
  15 // $Revision$
  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/gpu.hpp>
  29 #include <boost/mpl/aux_/config/static_constant.hpp>
  30 #include <boost/mpl/aux_/config/pp_counter.hpp>
  31 #include <boost/mpl/aux_/config/workaround.hpp>
  32
  33 #include <boost/preprocessor/cat.hpp>
  34
  35 #include <boost/config.hpp> // make sure 'size_t' is placed into 'std'
  36 #include <cstddef>
  37
  38 #if BOOST_WORKAROUND(BOOST_MSVC, == 1700)
  39 #include <boost/mpl/if.hpp>
  40 #endif
  41
  42 #if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x610)) \
  43     || (BOOST_MPL_CFG_GCC != 0) \
  44     || BOOST_WORKAROUND(__IBMCPP__, <= 600)
  45 #   define BOOST_MPL_CFG_ASSERT_USE_RELATION_NAMES
  46 #endif
  47
  48 #if BOOST_WORKAROUND(__MWERKS__, < 0x3202) \
  49     || BOOST_WORKAROUND(__EDG_VERSION__, <= 238) \
  50     || BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x610)) \
  51     || BOOST_WORKAROUND(__DMC__, BOOST_TESTED_AT(0x840))
  52 #   define BOOST_MPL_CFG_ASSERT_BROKEN_POINTER_TO_POINTER_TO_MEMBER
  53 #endif
  54
  55 // agurt, 10/nov/06: use enums for Borland (which cannot cope with static constants)
  56 // and GCC (which issues "unused variable" warnings when static constants are used
  57 // at a function scope)
  58 #if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x610)) \
  59     || (BOOST_MPL_CFG_GCC != 0) || (BOOST_MPL_CFG_GPU != 0)
  60 #   define BOOST_MPL_AUX_ASSERT_CONSTANT(T, expr) enum { expr }
  61 #else
  62 #   define BOOST_MPL_AUX_ASSERT_CONSTANT(T, expr) BOOST_STATIC_CONSTANT(T, expr)
  63 #endif
  64
  65
  66 BOOST_MPL_AUX_ADL_BARRIER_NAMESPACE_OPEN
  67
  68 struct failed {};
  69
  70 // agurt, 24/aug/04: MSVC 7.1 workaround here and below: return/accept
  71 // 'assert<false>' by reference; can't apply it unconditionally -- apparently it
  72 // degrades the quality of GCC diagnostics
  73 #if BOOST_WORKAROUND(BOOST_MSVC, == 1310)
  74 #   define AUX778076_ASSERT_ARG(x) x&
  75 #else
  76 #   define AUX778076_ASSERT_ARG(x) x
  77 #endif
  78
  79 template< bool C >  struct assert        { typedef void* type; };
  80 template<>          struct assert<false> { typedef AUX778076_ASSERT_ARG(assert) type; };
  81
  82 template< bool C >
  83 int assertion_failed( typename assert<C>::type );
  84
  85 template< bool C >
  86 struct assertion
  87 {
  88     static int failed( assert<false> );
  89 };
  90
  91 template<>
  92 struct assertion<true>
  93 {
  94     static int failed( void* );
  95 };
  96
  97 struct assert_
  98 {
  99 #if !defined(BOOST_MPL_CFG_NO_DEFAULT_PARAMETERS_IN_NESTED_TEMPLATES)
 100     template< typename T1, typename T2 = na, typename T3 = na, typename T4 = na > struct types {};
 101 #endif
 102     static assert_ const arg;
 103     enum relations { equal = 1, not_equal, greater, greater_equal, less, less_equal };
 104 };
 105
 106
 107 #if !defined(BOOST_MPL_CFG_ASSERT_USE_RELATION_NAMES)
 108
 109 bool operator==( failed, failed );
 110 bool operator!=( failed, failed );
 111 bool operator>( failed, failed );
 112 bool operator>=( failed, failed );
 113 bool operator<( failed, failed );
 114 bool operator<=( failed, failed );
 115
 116 #if defined(__EDG_VERSION__)
 117 template< bool (*)(failed, failed), long x, long y > struct assert_relation {};
 118 #   define BOOST_MPL_AUX_ASSERT_RELATION(x, y, r) assert_relation<r,x,y>
 119 #else
 120 template< BOOST_MPL_AUX_NTTP_DECL(long, x), BOOST_MPL_AUX_NTTP_DECL(long, y), bool (*)(failed, failed) >
 121 struct assert_relation {};
 122 #   define BOOST_MPL_AUX_ASSERT_RELATION(x, y, r) assert_relation<x,y,r>
 123 #endif
 124
 125 #else // BOOST_MPL_CFG_ASSERT_USE_RELATION_NAMES
 126
 127 boost::mpl::aux::weighted_tag<1>::type operator==( assert_, assert_ );
 128 boost::mpl::aux::weighted_tag<2>::type operator!=( assert_, assert_ );
 129 boost::mpl::aux::weighted_tag<3>::type operator>(  assert_, assert_ );
 130 boost::mpl::aux::weighted_tag<4>::type operator>=( assert_, assert_ );
 131 boost::mpl::aux::weighted_tag<5>::type operator<( assert_, assert_ );
 132 boost::mpl::aux::weighted_tag<6>::type operator<=( assert_, assert_ );
 133
 134 template< assert_::relations r, long x, long y > struct assert_relation {};
 135
 136 #endif
 137
 138 #if BOOST_WORKAROUND(BOOST_MSVC, == 1700)
 139
 140 template<class Pred>
 141 struct extract_assert_pred;
 142
 143 template<class Pred>
 144 struct extract_assert_pred<void(Pred)> { typedef Pred type; };
 145
 146 template<class Pred>
 147 struct eval_assert {
 148     typedef typename extract_assert_pred<Pred>::type P;
 149     typedef typename P::type p_type;
 150     typedef typename ::boost::mpl::if_c<p_type::value,
 151         AUX778076_ASSERT_ARG(assert<false>),
 152         failed ************ P::************
 153     >::type type;
 154 };
 155
 156 template<class Pred>
 157 struct eval_assert_not {
 158     typedef typename extract_assert_pred<Pred>::type P;
 159     typedef typename P::type p_type;
 160     typedef typename ::boost::mpl::if_c<!p_type::value,
 161         AUX778076_ASSERT_ARG(assert<false>),
 162         failed ************ ::boost::mpl::not_<P>::************
 163     >::type type;
 164 };
 165
 166 template< typename T >
 167 T make_assert_arg();
 168
 169 #elif !defined(BOOST_MPL_CFG_ASSERT_BROKEN_POINTER_TO_POINTER_TO_MEMBER)
 170
 171 template< bool > struct assert_arg_pred_impl { typedef int type; };
 172 template<> struct assert_arg_pred_impl<true> { typedef void* type; };
 173
 174 template< typename P > struct assert_arg_pred
 175 {
 176     typedef typename P::type p_type;
 177     typedef typename assert_arg_pred_impl< p_type::value >::type type;
 178 };
 179
 180 template< typename P > struct assert_arg_pred_not
 181 {
 182     typedef typename P::type p_type;
 183     BOOST_MPL_AUX_ASSERT_CONSTANT( bool, p = !p_type::value );
 184     typedef typename assert_arg_pred_impl<p>::type type;
 185 };
 186
 187 template< typename Pred >
 188 failed ************ (Pred::************
 189       assert_arg( void (*)(Pred), typename assert_arg_pred<Pred>::type )
 190     );
 191
 192 template< typename Pred >
 193 failed ************ (boost::mpl::not_<Pred>::************
 194       assert_not_arg( void (*)(Pred), typename assert_arg_pred_not<Pred>::type )
 195     );
 196
 197 template< typename Pred >
 198 AUX778076_ASSERT_ARG(assert<false>)
 199 assert_arg( void (*)(Pred), typename assert_arg_pred_not<Pred>::type );
 200
 201 template< typename Pred >
 202 AUX778076_ASSERT_ARG(assert<false>)
 203 assert_not_arg( void (*)(Pred), typename assert_arg_pred<Pred>::type );
 204
 205
 206 #else // BOOST_MPL_CFG_ASSERT_BROKEN_POINTER_TO_POINTER_TO_MEMBER
 207
 208 template< bool c, typename Pred > struct assert_arg_type_impl
 209 {
 210     typedef failed      ************ Pred::* mwcw83_wknd;
 211     typedef mwcw83_wknd ************* type;
 212 };
 213
 214 template< typename Pred > struct assert_arg_type_impl<true,Pred>
 215 {
 216     typedef AUX778076_ASSERT_ARG(assert<false>) type;
 217 };
 218
 219 template< typename Pred > struct assert_arg_type
 220     : assert_arg_type_impl< BOOST_MPL_AUX_VALUE_WKND(BOOST_MPL_AUX_NESTED_TYPE_WKND(Pred))::value, Pred >
 221 {
 222 };
 223
 224 template< typename Pred >
 225 typename assert_arg_type<Pred>::type
 226 assert_arg(void (*)(Pred), int);
 227
 228 template< typename Pred >
 229 typename assert_arg_type< boost::mpl::not_<Pred> >::type
 230 assert_not_arg(void (*)(Pred), int);
 231
 232 #   if !defined(BOOST_MPL_CFG_ASSERT_USE_RELATION_NAMES)
 233 template< long x, long y, bool (*r)(failed, failed) >
 234 typename assert_arg_type_impl< false,BOOST_MPL_AUX_ASSERT_RELATION(x,y,r) >::type
 235 assert_rel_arg( BOOST_MPL_AUX_ASSERT_RELATION(x,y,r) );
 236 #   else
 237 template< assert_::relations r, long x, long y >
 238 typename assert_arg_type_impl< false,assert_relation<r,x,y> >::type
 239 assert_rel_arg( assert_relation<r,x,y> );
 240 #   endif
 241
 242 #endif // BOOST_MPL_CFG_ASSERT_BROKEN_POINTER_TO_POINTER_TO_MEMBER
 243
 244 #undef AUX778076_ASSERT_ARG
 245
 246 BOOST_MPL_AUX_ADL_BARRIER_NAMESPACE_CLOSE
 247
 248 #if BOOST_WORKAROUND(BOOST_MSVC, == 1700)
 249
 250 // BOOST_MPL_ASSERT((pred<x,...>))
 251
 252 #define BOOST_MPL_ASSERT(pred) \
 253 BOOST_MPL_AUX_ASSERT_CONSTANT( \
 254       std::size_t \
 255     , BOOST_PP_CAT(mpl_assertion_in_line_,BOOST_MPL_AUX_PP_COUNTER()) = sizeof( \
 256           boost::mpl::assertion_failed<false>( \
 257               boost::mpl::make_assert_arg< \
 258                   typename boost::mpl::eval_assert<void pred>::type \
 259                 >() \
 260             ) \
 261         ) \
 262     ) \
 263 /**/
 264
 265 // BOOST_MPL_ASSERT_NOT((pred<x,...>))
 266
 267 #define BOOST_MPL_ASSERT_NOT(pred) \
 268 BOOST_MPL_AUX_ASSERT_CONSTANT( \
 269       std::size_t \
 270     , BOOST_PP_CAT(mpl_assertion_in_line_,BOOST_MPL_AUX_PP_COUNTER()) = sizeof( \
 271           boost::mpl::assertion_failed<false>( \
 272               boost::mpl::make_assert_arg< \
 273                   typename boost::mpl::eval_assert_not<void pred>::type \
 274                 >() \
 275             ) \
 276         ) \
 277     ) \
 278 /**/
 279
 280 #else
 281
 282 // BOOST_MPL_ASSERT((pred<x,...>))
 283
 284 #define BOOST_MPL_ASSERT(pred) \
 285 BOOST_MPL_AUX_ASSERT_CONSTANT( \
 286       std::size_t \
 287     , BOOST_PP_CAT(mpl_assertion_in_line_,BOOST_MPL_AUX_PP_COUNTER()) = sizeof( \
 288           boost::mpl::assertion_failed<false>( \
 289               boost::mpl::assert_arg( (void (*) pred)0, 1 ) \
 290             ) \
 291         ) \
 292     ) \
 293 /**/
 294
 295 // BOOST_MPL_ASSERT_NOT((pred<x,...>))
 296
 297 #if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
 298 #   define BOOST_MPL_ASSERT_NOT(pred) \
 299 enum { \
 300       BOOST_PP_CAT(mpl_assertion_in_line_,BOOST_MPL_AUX_PP_COUNTER()) = sizeof( \
 301           boost::mpl::assertion<false>::failed( \
 302               boost::mpl::assert_not_arg( (void (*) pred)0, 1 ) \
 303             ) \
 304         ) \
 305 }\
 306 /**/
 307 #else
 308 #   define BOOST_MPL_ASSERT_NOT(pred) \
 309 BOOST_MPL_AUX_ASSERT_CONSTANT( \
 310       std::size_t \
 311     , BOOST_PP_CAT(mpl_assertion_in_line_,BOOST_MPL_AUX_PP_COUNTER()) = sizeof( \
 312           boost::mpl::assertion_failed<false>( \
 313               boost::mpl::assert_not_arg( (void (*) pred)0, 1 ) \
 314             ) \
 315         ) \
 316    ) \
 317 /**/
 318 #endif
 319
 320 #endif
 321
 322 // BOOST_MPL_ASSERT_RELATION(x, ==|!=|<=|<|>=|>, y)
 323
 324 #if defined(BOOST_MPL_CFG_ASSERT_USE_RELATION_NAMES)
 325
 326 #   if !defined(BOOST_MPL_CFG_ASSERT_BROKEN_POINTER_TO_POINTER_TO_MEMBER)
 327 // agurt, 9/nov/06: 'enum' below is a workaround for gcc 4.0.4/4.1.1 bugs #29522 and #29518
 328 #   define BOOST_MPL_ASSERT_RELATION_IMPL(counter, x, rel, y)      \
 329 enum { BOOST_PP_CAT(mpl_assert_rel_value,counter) = (x rel y) }; \
 330 BOOST_MPL_AUX_ASSERT_CONSTANT( \
 331       std::size_t \
 332     , BOOST_PP_CAT(mpl_assertion_in_line_,counter) = sizeof( \
 333         boost::mpl::assertion_failed<BOOST_PP_CAT(mpl_assert_rel_value,counter)>( \
 334             (boost::mpl::failed ************ ( boost::mpl::assert_relation< \
 335                   boost::mpl::assert_::relations( sizeof( \
 336                       boost::mpl::assert_::arg rel boost::mpl::assert_::arg \
 337                     ) ) \
 338                 , x \
 339                 , y \
 340                 >::************)) 0 ) \
 341         ) \
 342     ) \
 343 /**/
 344 #   else
 345 #   define BOOST_MPL_ASSERT_RELATION_IMPL(counter, x, rel, y)    \
 346 BOOST_MPL_AUX_ASSERT_CONSTANT( \
 347       std::size_t \
 348     , BOOST_PP_CAT(mpl_assert_rel,counter) = sizeof( \
 349           boost::mpl::assert_::arg rel boost::mpl::assert_::arg \
 350         ) \
 351     ); \
 352 BOOST_MPL_AUX_ASSERT_CONSTANT( bool, BOOST_PP_CAT(mpl_assert_rel_value,counter) = (x rel y) ); \
 353 BOOST_MPL_AUX_ASSERT_CONSTANT( \
 354       std::size_t \
 355     , BOOST_PP_CAT(mpl_assertion_in_line_,counter) = sizeof( \
 356         boost::mpl::assertion_failed<BOOST_PP_CAT(mpl_assert_rel_value,counter)>( \
 357               boost::mpl::assert_rel_arg( boost::mpl::assert_relation< \
 358                   boost::mpl::assert_::relations(BOOST_PP_CAT(mpl_assert_rel,counter)) \
 359                 , x \
 360                 , y \
 361                 >() ) \
 362             ) \
 363         ) \
 364     ) \
 365 /**/
 366 #   endif
 367
 368 #   define BOOST_MPL_ASSERT_RELATION(x, rel, y) \
 369 BOOST_MPL_ASSERT_RELATION_IMPL(BOOST_MPL_AUX_PP_COUNTER(), x, rel, y) \
 370 /**/
 371
 372 #else // !BOOST_MPL_CFG_ASSERT_USE_RELATION_NAMES
 373
 374 #   if defined(BOOST_MPL_CFG_ASSERT_BROKEN_POINTER_TO_POINTER_TO_MEMBER)
 375 #   define BOOST_MPL_ASSERT_RELATION(x, rel, y) \
 376 BOOST_MPL_AUX_ASSERT_CONSTANT( \
 377       std::size_t \
 378     , BOOST_PP_CAT(mpl_assertion_in_line_,BOOST_MPL_AUX_PP_COUNTER()) = sizeof( \
 379         boost::mpl::assertion_failed<(x rel y)>( boost::mpl::assert_rel_arg( \
 380               boost::mpl::BOOST_MPL_AUX_ASSERT_RELATION(x,y,(&boost::mpl::operator rel))() \
 381             ) ) \
 382         ) \
 383     ) \
 384 /**/
 385 #   else
 386 #   define BOOST_MPL_ASSERT_RELATION(x, rel, y) \
 387 BOOST_MPL_AUX_ASSERT_CONSTANT( \
 388       std::size_t \
 389     , BOOST_PP_CAT(mpl_assertion_in_line_,BOOST_MPL_AUX_PP_COUNTER()) = sizeof( \
 390         boost::mpl::assertion_failed<(x rel y)>( (boost::mpl::failed ************ ( \
 391             boost::mpl::BOOST_MPL_AUX_ASSERT_RELATION(x,y,(&boost::mpl::operator rel))::************))0 ) \
 392         ) \
 393     ) \
 394 /**/
 395 #   endif
 396
 397 #endif
 398
 399
 400 // BOOST_MPL_ASSERT_MSG( (pred<x,...>::value), USER_PROVIDED_MESSAGE, (types<x,...>) )
 401
 402 #if BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3202))
 403 #   define BOOST_MPL_ASSERT_MSG_IMPL( counter, c, msg, types_ ) \
 404 struct msg; \
 405 typedef struct BOOST_PP_CAT(msg,counter) : boost::mpl::assert_ \
 406 { \
 407     using boost::mpl::assert_::types; \
 408     static boost::mpl::failed ************ (msg::************ assert_arg()) types_ \
 409     { return 0; } \
 410 } BOOST_PP_CAT(mpl_assert_arg,counter); \
 411 BOOST_MPL_AUX_ASSERT_CONSTANT( \
 412       std::size_t \
 413     , BOOST_PP_CAT(mpl_assertion_in_line_,counter) = sizeof( \
 414         boost::mpl::assertion<(c)>::failed( BOOST_PP_CAT(mpl_assert_arg,counter)::assert_arg() ) \
 415         ) \
 416     ) \
 417 /**/
 418 #else
 419 #   define BOOST_MPL_ASSERT_MSG_IMPL( counter, c, msg, types_ )  \
 420 struct msg; \
 421 typedef struct BOOST_PP_CAT(msg,counter) : boost::mpl::assert_ \
 422 { \
 423     static boost::mpl::failed ************ (msg::************ assert_arg()) types_ \
 424     { return 0; } \
 425 } BOOST_PP_CAT(mpl_assert_arg,counter); \
 426 BOOST_MPL_AUX_ASSERT_CONSTANT( \
 427       std::size_t \
 428     , BOOST_PP_CAT(mpl_assertion_in_line_,counter) = sizeof( \
 429         boost::mpl::assertion_failed<(c)>( BOOST_PP_CAT(mpl_assert_arg,counter)::assert_arg() ) \
 430         ) \
 431     ) \
 432 /**/
 433 #endif
 434
 435 #define BOOST_MPL_ASSERT_MSG( c, msg, types_ ) \
 436 BOOST_MPL_ASSERT_MSG_IMPL( BOOST_MPL_AUX_PP_COUNTER(), c, msg, types_ ) \
 437 /**/
 438
 439 #endif // BOOST_MPL_ASSERT_HPP_INCLUDED