boost/boost/mpl/assert.hpp

   1
   2 #ifndef BOOST_MPL_ASSERT_HPP_INCLUDED
   3 #define BOOST_MPL_ASSERT_HPP_INCLUDED
   4
   5 // Copyright Aleksey Gurtovoy 2000-2004
   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 // $Source: /cvsroot/boost/boost/boost/mpl/assert.hpp,v $
  14 // $Date: 2004/09/28 13:56:58 $
  15 // $Revision: 1.13 $
  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/workaround.hpp>
  29
  30 #include <boost/preprocessor/cat.hpp>
  31
  32 #if BOOST_WORKAROUND(__BORLANDC__, >= 0x560) && BOOST_WORKAROUND(__BORLANDC__, < 0x600) \
  33     || (BOOST_MPL_CFG_GCC != 0)
  34 #   define BOOST_MPL_CFG_ASSERT_USE_RELATION_NAMES
  35 #endif
  36
  37 #if BOOST_WORKAROUND(__MWERKS__, < 0x3202) \
  38     || BOOST_WORKAROUND(__EDG_VERSION__, <= 238) \
  39     || BOOST_WORKAROUND(__BORLANDC__, < 0x600) \
  40     || BOOST_WORKAROUND(__DMC__, BOOST_TESTED_AT(0x840))
  41 #   define BOOST_MPL_CFG_ASSERT_BROKEN_POINTER_TO_POINTER_TO_MEMBER
  42 #endif
  43
  44
  45 BOOST_MPL_AUX_ADL_BARRIER_NAMESPACE_OPEN
  46
  47 struct failed {};
  48
  49 // agurt, 24/aug/04: MSVC 7.1 workaround here and below: return/accept
  50 // 'assert<false>' by reference; can't apply it unconditionally -- apparently it
  51 // degrades quality of GCC diagnostics
  52 #if BOOST_WORKAROUND(BOOST_MSVC, == 1310)
  53 #   define AUX778076_ASSERT_ARG(x) x&
  54 #else
  55 #   define AUX778076_ASSERT_ARG(x) x
  56 #endif
  57
  58 template< bool C >  struct assert        { typedef void* type; };
  59 template<>          struct assert<false> { typedef AUX778076_ASSERT_ARG(assert) type; };
  60
  61 template< bool C >
  62 int assertion_failed( typename assert<C>::type );
  63
  64 template< bool C >
  65 struct assertion
  66 {
  67     static int failed( assert<false> );
  68 };
  69
  70 template<>
  71 struct assertion<true>
  72 {
  73     static int failed( void* );
  74 };
  75
  76 struct assert_
  77 {
  78 #if !defined(BOOST_MPL_CFG_NO_DEFAULT_PARAMETERS_IN_NESTED_TEMPLATES)
  79     template< typename T1, typename T2 = na, typename T3 = na, typename T4 = na > struct types {};
  80 #endif
  81     static assert_ const arg;
  82     enum relations { equal = 1, not_equal, greater, greater_equal, less, less_equal };
  83 };
  84
  85
  86 #if !defined(BOOST_MPL_CFG_ASSERT_USE_RELATION_NAMES)
  87
  88 bool operator==( failed, failed );
  89 bool operator!=( failed, failed );
  90 bool operator>( failed, failed );
  91 bool operator>=( failed, failed );
  92 bool operator<( failed, failed );
  93 bool operator<=( failed, failed );
  94
  95 #if defined(__EDG_VERSION__)
  96 template< bool (*)(failed, failed), long x, long y > struct assert_relation {};
  97 #   define BOOST_MPL_AUX_ASSERT_RELATION(x, y, r) assert_relation<r,x,y>
  98 #else
  99 template< BOOST_MPL_AUX_NTTP_DECL(long, x), BOOST_MPL_AUX_NTTP_DECL(long, y), bool (*)(failed, failed) >
 100 struct assert_relation {};
 101 #   define BOOST_MPL_AUX_ASSERT_RELATION(x, y, r) assert_relation<x,y,r>
 102 #endif
 103
 104 #else // BOOST_MPL_CFG_ASSERT_USE_RELATION_NAMES
 105
 106 boost::mpl::aux::weighted_tag<1>::type operator==( assert_, assert_ );
 107 boost::mpl::aux::weighted_tag<2>::type operator!=( assert_, assert_ );
 108 boost::mpl::aux::weighted_tag<3>::type operator>(  assert_, assert_ );
 109 boost::mpl::aux::weighted_tag<4>::type operator>=( assert_, assert_ );
 110 boost::mpl::aux::weighted_tag<5>::type operator<( assert_, assert_ );
 111 boost::mpl::aux::weighted_tag<6>::type operator<=( assert_, assert_ );
 112
 113 template< assert_::relations r, long x, long y > struct assert_relation {};
 114
 115 #endif
 116
 117
 118 #if !defined(BOOST_MPL_CFG_ASSERT_BROKEN_POINTER_TO_POINTER_TO_MEMBER)
 119
 120 template< bool > struct assert_arg_pred_impl { typedef int type; };
 121 template<> struct assert_arg_pred_impl<true> { typedef void* type; };
 122
 123 template< typename P > struct assert_arg_pred
 124 {
 125     typedef typename P::type p_type;
 126     typedef typename assert_arg_pred_impl< p_type::value >::type type;
 127 };
 128
 129 template< typename P > struct assert_arg_pred_not
 130 {
 131     typedef typename P::type p_type;
 132     enum { p = !p_type::value };
 133     typedef typename assert_arg_pred_impl<p>::type type;
 134 };
 135
 136 template< typename Pred >
 137 failed ************ (Pred::************
 138       assert_arg( void (*)(Pred), typename assert_arg_pred<Pred>::type )
 139     );
 140
 141 template< typename Pred >
 142 failed ************ (boost::mpl::not_<Pred>::************
 143       assert_not_arg( void (*)(Pred), typename assert_arg_pred_not<Pred>::type )
 144     );
 145
 146 template< typename Pred >
 147 AUX778076_ASSERT_ARG(assert<false>)
 148 assert_arg( void (*)(Pred), typename assert_arg_pred_not<Pred>::type );
 149
 150 template< typename Pred >
 151 AUX778076_ASSERT_ARG(assert<false>)
 152 assert_not_arg( void (*)(Pred), typename assert_arg_pred<Pred>::type );
 153
 154
 155 #else // BOOST_MPL_CFG_ASSERT_BROKEN_POINTER_TO_POINTER_TO_MEMBER
 156
 157 template< bool c, typename Pred > struct assert_arg_type_impl
 158 {
 159     typedef failed      ************ Pred::* mwcw83_wknd;
 160     typedef mwcw83_wknd ************* type;
 161 };
 162
 163 template< typename Pred > struct assert_arg_type_impl<true,Pred>
 164 {
 165     typedef AUX778076_ASSERT_ARG(assert<false>) type;
 166 };
 167
 168 template< typename Pred > struct assert_arg_type
 169     : assert_arg_type_impl< BOOST_MPL_AUX_VALUE_WKND(BOOST_MPL_AUX_NESTED_TYPE_WKND(Pred))::value, Pred >
 170 {
 171 };
 172
 173 template< typename Pred >
 174 typename assert_arg_type<Pred>::type
 175 assert_arg(void (*)(Pred), int);
 176
 177 template< typename Pred >
 178 typename assert_arg_type< boost::mpl::not_<Pred> >::type
 179 assert_not_arg(void (*)(Pred), int);
 180
 181 #   if !defined(BOOST_MPL_CFG_ASSERT_USE_RELATION_NAMES)
 182 template< long x, long y, bool (*r)(failed, failed) >
 183 typename assert_arg_type_impl< false,BOOST_MPL_AUX_ASSERT_RELATION(x,y,r) >::type
 184 assert_rel_arg( BOOST_MPL_AUX_ASSERT_RELATION(x,y,r) );
 185 #   else
 186 template< assert_::relations r, long x, long y >
 187 typename assert_arg_type_impl< false,assert_relation<r,x,y> >::type
 188 assert_rel_arg( assert_relation<r,x,y> );
 189 #   endif
 190
 191 #endif // BOOST_MPL_CFG_ASSERT_BROKEN_POINTER_TO_POINTER_TO_MEMBER
 192
 193 #undef AUX778076_ASSERT_ARG
 194
 195 BOOST_MPL_AUX_ADL_BARRIER_NAMESPACE_CLOSE
 196
 197
 198 // BOOST_MPL_ASSERT((pred<x,...>))
 199
 200 #define BOOST_MPL_ASSERT(pred) \
 201 enum { \
 202     BOOST_PP_CAT(mpl_assertion_in_line_,__LINE__) = sizeof( \
 203           boost::mpl::assertion_failed<false>( \
 204               boost::mpl::assert_arg( (void (*) pred)0, 1 ) \
 205             ) \
 206         ) \
 207 }\
 208 /**/
 209
 210 // BOOST_MPL_ASSERT_NOT((pred<x,...>))
 211
 212 #if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
 213 #   define BOOST_MPL_ASSERT_NOT(pred) \
 214 enum { \
 215     BOOST_PP_CAT(mpl_assertion_in_line_,__LINE__) = sizeof( \
 216           boost::mpl::assertion<false>::failed( \
 217               boost::mpl::assert_not_arg( (void (*) pred)0, 1 ) \
 218             ) \
 219         ) \
 220 }\
 221 /**/
 222 #else
 223 #   define BOOST_MPL_ASSERT_NOT(pred) \
 224 enum { \
 225     BOOST_PP_CAT(mpl_assertion_in_line_,__LINE__) = sizeof( \
 226           boost::mpl::assertion_failed<false>( \
 227               boost::mpl::assert_not_arg( (void (*) pred)0, 1 ) \
 228             ) \
 229         ) \
 230 }\
 231 /**/
 232 #endif
 233
 234 // BOOST_MPL_ASSERT_RELATION(x, ==|!=|<=|<|>=|>, y)
 235
 236 #if defined(BOOST_MPL_CFG_ASSERT_USE_RELATION_NAMES)
 237
 238 #   if !defined(BOOST_MPL_CFG_ASSERT_BROKEN_POINTER_TO_POINTER_TO_MEMBER)
 239 #   define BOOST_MPL_ASSERT_RELATION(x, rel, y) \
 240 enum { \
 241       BOOST_PP_CAT(mpl_assertion_in_line_,__LINE__) = sizeof( \
 242         boost::mpl::assertion_failed<(x rel y)>( \
 243             (boost::mpl::failed ************ ( boost::mpl::assert_relation< \
 244                   boost::mpl::assert_::relations( sizeof( \
 245                       boost::mpl::assert_::arg rel boost::mpl::assert_::arg \
 246                     ) ) \
 247                 , x \
 248                 , y \
 249                 >::************)) 0 ) \
 250         ) \
 251 } \
 252 /**/
 253 #   else
 254 #   define BOOST_MPL_ASSERT_RELATION(x, rel, y) \
 255 enum { \
 256       BOOST_PP_CAT(mpl_assert_rel,__LINE__) = sizeof(boost::mpl::assert_::arg rel boost::mpl::assert_::arg) \
 257     , BOOST_PP_CAT(mpl_assert_rel_value,__LINE__) = (x rel y) \
 258     , BOOST_PP_CAT(mpl_assertion_in_line_,__LINE__) = sizeof( \
 259         boost::mpl::assertion_failed<BOOST_PP_CAT(mpl_assert_rel_value,__LINE__)>( \
 260               boost::mpl::assert_rel_arg( boost::mpl::assert_relation< \
 261                   boost::mpl::assert_::relations(BOOST_PP_CAT(mpl_assert_rel,__LINE__)) \
 262                 , x \
 263                 , y \
 264                 >() ) \
 265             ) \
 266         ) \
 267 } \
 268 /**/
 269 #   endif
 270
 271 #else // !BOOST_MPL_CFG_ASSERT_USE_RELATION_NAMES
 272
 273 #   if defined(BOOST_MPL_CFG_ASSERT_BROKEN_POINTER_TO_POINTER_TO_MEMBER)
 274 #   define BOOST_MPL_ASSERT_RELATION(x, rel, y) \
 275 enum { \
 276     BOOST_PP_CAT(mpl_assertion_in_line_,__LINE__) = sizeof( \
 277         boost::mpl::assertion_failed<(x rel y)>( boost::mpl::assert_rel_arg( \
 278               boost::mpl::BOOST_MPL_AUX_ASSERT_RELATION(x,y,(&boost::mpl::operator rel))() \
 279             ) ) \
 280         ) \
 281 }\
 282 /**/
 283 #   else
 284 #   define BOOST_MPL_ASSERT_RELATION(x, rel, y) \
 285 enum { \
 286     BOOST_PP_CAT(mpl_assertion_in_line_,__LINE__) = sizeof( \
 287         boost::mpl::assertion_failed<(x rel y)>( (boost::mpl::failed ************ ( \
 288             boost::mpl::BOOST_MPL_AUX_ASSERT_RELATION(x,y,(&boost::mpl::operator rel))::************))0 ) \
 289         ) \
 290 }\
 291 /**/
 292 #   endif
 293
 294 #endif
 295
 296
 297 // BOOST_MPL_ASSERT_MSG( (pred<x,...>::value), USER_PROVIDED_MESSAGE, (types<x,...>) )
 298
 299 #if BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3202))
 300 #   define BOOST_MPL_ASSERT_MSG( c, msg, types_ ) \
 301     struct msg; \
 302     typedef struct BOOST_PP_CAT(msg,__LINE__) : boost::mpl::assert_ \
 303     { \
 304         using boost::mpl::assert_::types; \
 305         static boost::mpl::failed ************ (msg::************ assert_arg()) types_ \
 306         { return 0; } \
 307     } BOOST_PP_CAT(mpl_assert_arg,__LINE__); \
 308     enum { \
 309         BOOST_PP_CAT(mpl_assertion_in_line_,__LINE__) = sizeof( \
 310             boost::mpl::assertion<(c)>::failed( BOOST_PP_CAT(mpl_assert_arg,__LINE__)::assert_arg() ) \
 311             ) \
 312     }\
 313 /**/
 314 #else
 315 #   define BOOST_MPL_ASSERT_MSG( c, msg, types_ ) \
 316     struct msg; \
 317     typedef struct BOOST_PP_CAT(msg,__LINE__) : boost::mpl::assert_ \
 318     { \
 319         static boost::mpl::failed ************ (msg::************ assert_arg()) types_ \
 320         { return 0; } \
 321     } BOOST_PP_CAT(mpl_assert_arg,__LINE__); \
 322     enum { \
 323         BOOST_PP_CAT(mpl_assertion_in_line_,__LINE__) = sizeof( \
 324             boost::mpl::assertion_failed<(c)>( BOOST_PP_CAT(mpl_assert_arg,__LINE__)::assert_arg() ) \
 325             ) \
 326     }\
 327 /**/
 328 #endif
 329
 330 #endif // BOOST_MPL_ASSERT_HPP_INCLUDED