/*
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Copyright 2017-2018 Glen Joseph Fernandes
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(glenjofe@gmail.com)
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Distributed under the Boost Software License,
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Version 1.0. (See accompanying file LICENSE_1_0.txt
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or copy at http://www.boost.org/LICENSE_1_0.txt)
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*/
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#ifndef BOOST_TT_DETAIL_DETECTOR_HPP_INCLUDED
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#define BOOST_TT_DETAIL_DETECTOR_HPP_INCLUDED
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#include <boost/type_traits/integral_constant.hpp>
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#include <boost/type_traits/make_void.hpp>
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namespace boost {
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namespace detail {
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template<class T>
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using detector_t = typename boost::make_void<T>::type;
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template<class Default, class, template<class...> class, class...>
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struct detector {
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using value_t = boost::false_type;
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using type = Default;
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};
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template<class Default, template<class...> class Op, class... Args>
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struct detector<Default, detector_t<Op<Args...> >, Op, Args...> {
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using value_t = boost::true_type;
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using type = Op<Args...>;
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};
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} /* detail */
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} /* boost */
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#endif
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