Squashed 'third_party/boostorg/concept_check/' content from commit ed0a0eb
Change-Id: Ib7230965334f9501601efc300242efde8352a380
git-subtree-dir: third_party/boostorg/concept_check
git-subtree-split: ed0a0ebd72f778cfa4931e0538ea34c28db3a42b
diff --git a/include/boost/concept_check/general.hpp b/include/boost/concept_check/general.hpp
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+// Copyright David Abrahams 2006. Distributed under the Boost
+// Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#ifndef BOOST_CONCEPT_CHECK_MSVC_DWA2006429_HPP
+# define BOOST_CONCEPT_CHECK_MSVC_DWA2006429_HPP
+
+# ifdef BOOST_OLD_CONCEPT_SUPPORT
+# include <boost/concept_check/has_constraints.hpp>
+# include <boost/mpl/if.hpp>
+# endif
+
+
+// This implementation works on GCC and Comeau, but has actually been
+// fairly carefully tuned to work on GCC versions starting with
+// gcc-2.95.x. If you're trying to get an additional compiler to pass
+// the tests you might consider breaking out a separate gcc.hpp and
+// starting over on the general case.
+namespace boost
+{
+ namespace concept_checking
+ {
+ template <void(*)()> struct instantiate {};
+ }
+
+ template <class ModelFn> struct concept_check_;
+
+ template <class Model>
+ void concept_check_failed()
+ {
+ ((Model*)0)->~Model();
+ }
+
+ template <class Model>
+ struct concept_check
+ {
+ concept_checking::instantiate<concept_check_failed<Model> > x;
+ enum { instantiate = 1 };
+ };
+
+# ifdef BOOST_OLD_CONCEPT_SUPPORT
+
+ template <class Model>
+ void constraint_check_failed()
+ {
+ ((Model*)0)->constraints();
+ }
+
+ template <class Model>
+ struct constraint_check
+ {
+ concept_checking::instantiate<constraint_check_failed<Model> > x;
+ enum { instantiate = 1 };
+ };
+
+ template <class Model>
+ struct concept_check_<void(*)(Model)>
+ : mpl::if_c<
+ concept_checking::has_constraints<Model>::value
+ , constraint_check<Model>
+ , concept_check<Model>
+ >::type
+ {};
+
+# else
+
+ template <class Model>
+ struct concept_check_<void(*)(Model)>
+ : concept_check<Model>
+ {};
+
+# endif
+
+ // Usage, in class or function context:
+ //
+ // BOOST_CONCEPT_ASSERT((UnaryFunctionConcept<F,bool,int>));
+# define BOOST_CONCEPT_ASSERT( ModelInParens ) \
+ enum { BOOST_PP_CAT(boost_concept_check,__LINE__) = \
+ ::boost::concept_check_<void(*) ModelInParens>::instantiate \
+ }
+}
+
+#endif // BOOST_CONCEPT_CHECK_MSVC_DWA2006429_HPP