1 // Copyright David Abrahams 2006. Distributed under the Boost
2 // Software License, Version 1.0. (See accompanying
3 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
4 #ifndef BOOST_CONCEPT_USAGE_DWA2006919_HPP
5 # define BOOST_CONCEPT_USAGE_DWA2006919_HPP
6 
7 # include <boost/concept/assert.hpp>
8 # include <boost/detail/workaround.hpp>
9 # include <boost/concept/detail/backward_compatibility.hpp>
10 
11 namespace boost { namespace concepts {
12 
13 # if BOOST_WORKAROUND(__GNUC__, == 2)
14 
15 #  define BOOST_CONCEPT_USAGE(model) ~model()
16 
17 # else
18 
19 template <class Model>
20 struct usage_requirements
21 {
22     ~usage_requirements() { ((Model*)0)->~Model(); }
23 };
24 
25 #  if BOOST_WORKAROUND(__GNUC__, <= 3)
26 
27 #   define BOOST_CONCEPT_USAGE(model)                                    \
28       model(); /* at least 2.96 and 3.4.3 both need this :( */           \
29       BOOST_CONCEPT_ASSERT((boost::concepts::usage_requirements<model>)); \
30       ~model()
31 
32 #  else
33 
34 #   define BOOST_CONCEPT_USAGE(model)                                    \
35       BOOST_CONCEPT_ASSERT((boost::concepts::usage_requirements<model>)); \
36       ~model()
37 
38 #  endif
39 
40 # endif
41 
42 }} // namespace boost::concepts
43 
44 #endif // BOOST_CONCEPT_USAGE_DWA2006919_HPP
45