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- /*=============================================================================
- Copyright (c) 2015 Kohei Takahashi
- Use modification and distribution are subject to 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 FUSION_TEST_SFINAE_FRIENDLY_HPP
- #define FUSION_TEST_SFINAE_FRIENDLY_HPP
- #include <boost/config.hpp>
- #include <boost/mpl/bool.hpp>
- #include <boost/mpl/assert.hpp>
- #include <boost/utility/result_of.hpp>
- #include <boost/core/enable_if.hpp>
- #if !defined(BOOST_NO_SFINAE) && defined(BOOST_RESULT_OF_USE_DECLTYPE)
- #include <boost/fusion/container/vector.hpp>
- namespace sfinae_friendly
- {
- template <typename> struct arg_;
- template <typename R, typename T> struct arg_<R(T)> { typedef T type; };
- template <typename Traits, typename = void>
- struct check
- : boost::mpl::true_ { };
- template <typename Traits>
- struct check<Traits, typename boost::enable_if_has_type<typename Traits::type>::type>
- : boost::mpl::false_ { };
- struct unspecified {};
- typedef boost::fusion::vector<> v0;
- typedef boost::fusion::vector<unspecified> v1;
- typedef boost::fusion::vector<unspecified, unspecified> v2;
- typedef boost::fusion::vector<unspecified, unspecified, unspecified> v3;
- }
- #define SFINAE_FRIENDLY_ASSERT(Traits) \
- BOOST_MPL_ASSERT((::sfinae_friendly::check<typename ::sfinae_friendly::arg_<void Traits>::type>))
- #else
- #define SFINAE_FRIENDLY_ASSERT(Traits) \
- BOOST_MPL_ASSERT((boost::mpl::true_))
- #endif
- #endif // FUSION_TEST_SFINAE_FRIENDLY_HPP
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