| /* |
| 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_IS_DETECTED_HPP_INCLUDED |
| #define BOOST_TT_IS_DETECTED_HPP_INCLUDED |
| |
| #include <boost/type_traits/detail/detector.hpp> |
| #include <boost/type_traits/nonesuch.hpp> |
| |
| namespace boost { |
| |
| template<template<class...> class Op, class... Args> |
| using is_detected = typename |
| detail::detector<nonesuch, void, Op, Args...>::value_t; |
| |
| #if !defined(BOOST_NO_CXX14_VARIABLE_TEMPLATES) |
| template<template<class...> class Op, class... Args> |
| constexpr bool is_detected_v = is_detected<Op, Args...>::value; |
| #endif |
| |
| } /* boost */ |
| |
| #endif |
