/*//////////////////////////////////////////////////////////////////////////////
    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
