/*! @file Defines `boost::hana::Product`. @copyright Louis Dionne 2013-2016 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_CONCEPT_PRODUCT_HPP #define BOOST_HANA_CONCEPT_PRODUCT_HPP #include <boost/hana/fwd/concept/product.hpp> #include <boost/hana/config.hpp> #include <boost/hana/core/default.hpp> #include <boost/hana/core/tag_of.hpp> #include <boost/hana/first.hpp> #include <boost/hana/second.hpp> BOOST_HANA_NAMESPACE_BEGIN template <typename P> struct Product { using Tag = typename tag_of<P>::type; static constexpr bool value = !is_default<first_impl<Tag>>::value && !is_default<second_impl<Tag>>::value; }; BOOST_HANA_NAMESPACE_END #endif // !BOOST_HANA_CONCEPT_PRODUCT_HPP