2 #ifndef BOOST_MPL_ASSERT_HPP_INCLUDED
3 #define BOOST_MPL_ASSERT_HPP_INCLUDED
5 // Copyright Aleksey Gurtovoy 2000-2006
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)
11 // See http://www.boost.org/libs/mpl for documentation.
13 // $Id: assert.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
14 // $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $
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>
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>
32 #include <boost/preprocessor/cat.hpp>
34 #include <boost/config.hpp> // make sure 'size_t' is placed into 'std'
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
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
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 }
58 # define BOOST_MPL_AUX_ASSERT_CONSTANT(T, expr) BOOST_STATIC_CONSTANT(T, expr)
62 BOOST_MPL_AUX_ADL_BARRIER_NAMESPACE_OPEN
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&
72 # define AUX778076_ASSERT_ARG(x) x
75 template< bool C > struct assert { typedef void* type; };
76 template<> struct assert<false> { typedef AUX778076_ASSERT_ARG(assert) type; };
79 int assertion_failed( typename assert<C>::type );
84 static int failed( assert<false> );
88 struct assertion<true>
90 static int failed( void* );
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 {};
98 static assert_ const arg;
99 enum relations { equal = 1, not_equal, greater, greater_equal, less, less_equal };
103 #if !defined(BOOST_MPL_CFG_ASSERT_USE_RELATION_NAMES)
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 );
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>
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>
121 #else // BOOST_MPL_CFG_ASSERT_USE_RELATION_NAMES
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_ );
130 template< assert_::relations r, long x, long y > struct assert_relation {};
135 #if !defined(BOOST_MPL_CFG_ASSERT_BROKEN_POINTER_TO_POINTER_TO_MEMBER)
137 template< bool > struct assert_arg_pred_impl { typedef int type; };
138 template<> struct assert_arg_pred_impl<true> { typedef void* type; };
140 template< typename P > struct assert_arg_pred
142 typedef typename P::type p_type;
143 typedef typename assert_arg_pred_impl< p_type::value >::type type;
146 template< typename P > struct assert_arg_pred_not
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;
153 template< typename Pred >
154 failed ************ (Pred::************
155 assert_arg( void (*)(Pred), typename assert_arg_pred<Pred>::type )
158 template< typename Pred >
159 failed ************ (boost::mpl::not_<Pred>::************
160 assert_not_arg( void (*)(Pred), typename assert_arg_pred_not<Pred>::type )
163 template< typename Pred >
164 AUX778076_ASSERT_ARG(assert<false>)
165 assert_arg( void (*)(Pred), typename assert_arg_pred_not<Pred>::type );
167 template< typename Pred >
168 AUX778076_ASSERT_ARG(assert<false>)
169 assert_not_arg( void (*)(Pred), typename assert_arg_pred<Pred>::type );
172 #else // BOOST_MPL_CFG_ASSERT_BROKEN_POINTER_TO_POINTER_TO_MEMBER
174 template< bool c, typename Pred > struct assert_arg_type_impl
176 typedef failed ************ Pred::* mwcw83_wknd;
177 typedef mwcw83_wknd ************* type;
180 template< typename Pred > struct assert_arg_type_impl<true,Pred>
182 typedef AUX778076_ASSERT_ARG(assert<false>) type;
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 >
190 template< typename Pred >
191 typename assert_arg_type<Pred>::type
192 assert_arg(void (*)(Pred), int);
194 template< typename Pred >
195 typename assert_arg_type< boost::mpl::not_<Pred> >::type
196 assert_not_arg(void (*)(Pred), int);
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) );
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> );
208 #endif // BOOST_MPL_CFG_ASSERT_BROKEN_POINTER_TO_POINTER_TO_MEMBER
210 #undef AUX778076_ASSERT_ARG
212 BOOST_MPL_AUX_ADL_BARRIER_NAMESPACE_CLOSE
215 // BOOST_MPL_ASSERT((pred<x,...>))
217 #define BOOST_MPL_ASSERT(pred) \
218 BOOST_MPL_AUX_ASSERT_CONSTANT( \
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 ) \
228 // BOOST_MPL_ASSERT_NOT((pred<x,...>))
230 #if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
231 # define BOOST_MPL_ASSERT_NOT(pred) \
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 ) \
241 # define BOOST_MPL_ASSERT_NOT(pred) \
242 BOOST_MPL_AUX_ASSERT_CONSTANT( \
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 ) \
253 // BOOST_MPL_ASSERT_RELATION(x, ==|!=|<=|<|>=|>, y)
255 #if defined(BOOST_MPL_CFG_ASSERT_USE_RELATION_NAMES)
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( \
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 \
271 >::************)) 0 ) \
276 # define BOOST_MPL_ASSERT_RELATION_IMPL(counter, x, rel, y) \
277 BOOST_MPL_AUX_ASSERT_CONSTANT( \
279 , BOOST_PP_CAT(mpl_assert_rel,counter) = sizeof( \
280 boost::mpl::assert_::arg rel boost::mpl::assert_::arg \
283 BOOST_MPL_AUX_ASSERT_CONSTANT( bool, BOOST_PP_CAT(mpl_assert_rel_value,counter) = (x rel y) ); \
284 BOOST_MPL_AUX_ASSERT_CONSTANT( \
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)) \
299 # define BOOST_MPL_ASSERT_RELATION(x, rel, y) \
300 BOOST_MPL_ASSERT_RELATION_IMPL(BOOST_MPL_AUX_PP_COUNTER(), x, rel, y) \
303 #else // !BOOST_MPL_CFG_ASSERT_USE_RELATION_NAMES
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( \
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))() \
317 # define BOOST_MPL_ASSERT_RELATION(x, rel, y) \
318 BOOST_MPL_AUX_ASSERT_CONSTANT( \
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 ) \
331 // BOOST_MPL_ASSERT_MSG( (pred<x,...>::value), USER_PROVIDED_MESSAGE, (types<x,...>) )
333 #if BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3202))
334 # define BOOST_MPL_ASSERT_MSG_IMPL( counter, c, msg, types_ ) \
336 typedef struct BOOST_PP_CAT(msg,counter) : boost::mpl::assert_ \
338 using boost::mpl::assert_::types; \
339 static boost::mpl::failed ************ (msg::************ assert_arg()) types_ \
341 } BOOST_PP_CAT(mpl_assert_arg,counter); \
342 BOOST_MPL_AUX_ASSERT_CONSTANT( \
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() ) \
350 # define BOOST_MPL_ASSERT_MSG_IMPL( counter, c, msg, types_ ) \
352 typedef struct BOOST_PP_CAT(msg,counter) : boost::mpl::assert_ \
354 static boost::mpl::failed ************ (msg::************ assert_arg()) types_ \
356 } BOOST_PP_CAT(mpl_assert_arg,counter); \
357 BOOST_MPL_AUX_ASSERT_CONSTANT( \
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() ) \
366 #define BOOST_MPL_ASSERT_MSG( c, msg, types_ ) \
367 BOOST_MPL_ASSERT_MSG_IMPL( BOOST_MPL_AUX_PP_COUNTER(), c, msg, types_ ) \
370 #endif // BOOST_MPL_ASSERT_HPP_INCLUDED