文件操作 - detector.hpp
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文件: /usr/include/boost/type_traits/detail/detector.hpp
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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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