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- /*
- Copyright 2017-2018 Glen Joseph Fernandes
- (glenjofe@gmail.com)
- 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_TT_DETAIL_DETECTOR_HPP_INCLUDED
- #define BOOST_TT_DETAIL_DETECTOR_HPP_INCLUDED
- #include <boost/type_traits/integral_constant.hpp>
- #include <boost/type_traits/make_void.hpp>
- namespace boost {
- namespace detail {
- template<class T>
- using detector_t = typename boost::make_void<T>::type;
- template<class Default, class, template<class...> class, class...>
- struct detector {
- using value_t = boost::false_type;
- using type = Default;
- };
- template<class Default, template<class...> class Op, class... Args>
- struct detector<Default, detector_t<Op<Args...> >, Op, Args...> {
- using value_t = boost::true_type;
- using type = Op<Args...>;
- };
- } /* detail */
- } /* boost */
- #endif
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