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File: default.hpp
/*! @file Defines `boost::hana::default_` and `boost::hana::is_default`. Copyright Louis Dionne 2013-2022 Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt) */ #ifndef BOOST_HANA_CORE_DEFAULT_HPP #define BOOST_HANA_CORE_DEFAULT_HPP #include <boost/hana/fwd/core/default.hpp> #include <boost/hana/config.hpp> #include <type_traits> namespace boost { namespace hana { template <typename Method, typename> struct is_default : std::false_type { }; template <typename Method> struct is_default<Method, decltype((void) static_cast<default_>(*(Method*)0) )> : std::true_type { }; }} // end namespace boost::hana #endif // !BOOST_HANA_CORE_DEFAULT_HPP