/*============================================================================= Copyright (c) 2011-2015 Bolero MURAKAMI https://github.com/bolero-MURAKAMI/Sprout 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 SPROUT_WEED_DETAIL_IS_UNUSED_AND_ELEM_HPP #define SPROUT_WEED_DETAIL_IS_UNUSED_AND_ELEM_HPP #include <type_traits> #include <sprout/config.hpp> #include <sprout/type_traits/integral_constant.hpp> #include <sprout/weed/traits/type/is_unused.hpp> namespace sprout { namespace weed { namespace detail { template<typename T, typename U, typename = void> struct is_unused_and_elem : public sprout::false_type {}; template<typename T, typename U> struct is_unused_and_elem< T, U, typename std::enable_if< sprout::weed::traits::is_unused<T>::value && !sprout::weed::traits::is_unused<U>::value >::type > : public sprout::true_type {}; } // namespace detail } // namespace weed } // namespace sprout #endif // #ifndef SPROUT_WEED_DETAIL_IS_UNUSED_AND_ELEM_HPP