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/*////////////////////////////////////////////////////////////////////////////// Copyright (c) 2014 Jamboree 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_SPIRIT_X3_IS_CALLABLE_HPP_INCLUDED #define BOOST_SPIRIT_X3_IS_CALLABLE_HPP_INCLUDED #include <boost/mpl/bool.hpp> namespace boost { namespace spirit { namespace x3 { namespace detail { template <typename Sig, typename Enable = void> struct is_callable_impl : mpl::false_ {}; template <typename F, typename... A> struct is_callable_impl<F(A...), decltype(void(std::declval<F>()(std::declval<A>()...)))> : mpl::true_ {}; }}}} namespace boost { namespace spirit { namespace x3 { template <typename Sig> struct is_callable; template <typename F, typename... A> struct is_callable<F(A...)> : detail::is_callable_impl<F(A...)> {}; }}} #endif