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
66BOOST_MPL_AUX_ADL_BARRIER_NAMESPACE_OPEN
67
68struct 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
79template< bool C > struct assert { typedef void* type; };
80template<> struct assert<false> { typedef AUX778076_ASSERT_ARG(assert) type; };
81
82template< bool C >
83int assertion_failed( typename assert<C>::type );
84
85template< bool C >
86struct assertion
87{
88 static int failed( assert<false> );
89};
90
91template<>
92struct assertion<true>
93{
94 static int failed( void* );
95};
96
97struct 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
109bool operator==( failed, failed );
110bool operator!=( failed, failed );
111bool operator>( failed, failed );
112bool operator>=( failed, failed );
113bool operator<( failed, failed );
114bool operator<=( failed, failed );
115
116#if defined(__EDG_VERSION__)
117template< 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
120template< BOOST_MPL_AUX_NTTP_DECL(long, x), BOOST_MPL_AUX_NTTP_DECL(long, y), bool (*)(failed, failed) >
121struct 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
127boost::mpl::aux::weighted_tag<1>::type operator==( assert_, assert_ );
128boost::mpl::aux::weighted_tag<2>::type operator!=( assert_, assert_ );
129boost::mpl::aux::weighted_tag<3>::type operator>( assert_, assert_ );
130boost::mpl::aux::weighted_tag<4>::type operator>=( assert_, assert_ );
131boost::mpl::aux::weighted_tag<5>::type operator<( assert_, assert_ );
132boost::mpl::aux::weighted_tag<6>::type operator<=( assert_, assert_ );
133
134template< assert_::relations r, long x, long y > struct assert_relation {};
135
136#endif
137
138#if BOOST_WORKAROUND(BOOST_MSVC, == 1700)
139
140template<class Pred>
141struct extract_assert_pred;
142
143template<class Pred>
144struct extract_assert_pred<void(Pred)> { typedef Pred type; };
145
146template<class Pred>
147struct 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
156template<class Pred>
157struct 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
166template< typename T >
167T make_assert_arg();
168
169#elif !defined(BOOST_MPL_CFG_ASSERT_BROKEN_POINTER_TO_POINTER_TO_MEMBER)
170
171template< bool > struct assert_arg_pred_impl { typedef int type; };
172template<> struct assert_arg_pred_impl<true> { typedef void* type; };
173
174template< 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
180template< 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
187template< typename Pred >
188failed ************ (Pred::************
189 assert_arg( void (*)(Pred), typename assert_arg_pred<Pred>::type )
190 );
191
192template< typename Pred >
193failed ************ (boost::mpl::not_<Pred>::************
194 assert_not_arg( void (*)(Pred), typename assert_arg_pred_not<Pred>::type )
195 );
196
197template< typename Pred >
198AUX778076_ASSERT_ARG(assert<false>)
199assert_arg( void (*)(Pred), typename assert_arg_pred_not<Pred>::type );
200
201template< typename Pred >
202AUX778076_ASSERT_ARG(assert<false>)
203assert_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
208template< bool c, typename Pred > struct assert_arg_type_impl
209{
210 typedef failed ************ Pred::* mwcw83_wknd;
211 typedef mwcw83_wknd ************* type;
212};
213
214template< typename Pred > struct assert_arg_type_impl<true,Pred>
215{
216 typedef AUX778076_ASSERT_ARG(assert<false>) type;
217};
218
219template< 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
224template< typename Pred >
225typename assert_arg_type<Pred>::type
226assert_arg(void (*)(Pred), int);
227
228template< typename Pred >
229typename assert_arg_type< boost::mpl::not_<Pred> >::type
230assert_not_arg(void (*)(Pred), int);
231
232# if !defined(BOOST_MPL_CFG_ASSERT_USE_RELATION_NAMES)
233template< long x, long y, bool (*r)(failed, failed) >
234typename assert_arg_type_impl< false,BOOST_MPL_AUX_ASSERT_RELATION(x,y,r) >::type
235assert_rel_arg( BOOST_MPL_AUX_ASSERT_RELATION(x,y,r) );
236# else
237template< assert_::relations r, long x, long y >
238typename assert_arg_type_impl< false,assert_relation<r,x,y> >::type
239assert_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
246BOOST_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) \
253BOOST_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) \
268BOOST_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) \
285BOOST_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) \
299enum { \
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) \
309BOOST_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) \
329enum { BOOST_PP_CAT(mpl_assert_rel_value,counter) = (x rel y) }; \
330BOOST_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) \
346BOOST_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 ); \
352BOOST_MPL_AUX_ASSERT_CONSTANT( bool, BOOST_PP_CAT(mpl_assert_rel_value,counter) = (x rel y) ); \
353BOOST_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) \
369BOOST_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) \
376BOOST_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) \
387BOOST_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_ ) \
404struct msg; \
405typedef 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); \
411BOOST_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_ ) \
420struct msg; \
421typedef 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); \
426BOOST_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_ ) \
436BOOST_MPL_ASSERT_MSG_IMPL( BOOST_MPL_AUX_PP_COUNTER(), c, msg, types_ ) \
437/**/
438
439#endif // BOOST_MPL_ASSERT_HPP_INCLUDED
440

source code of boost/boost/mpl/assert.hpp