boost/hana/core/default.hpp
/*!
@file
Defines `boost::hana::default_` and `boost::hana::is_default`.
@copyright Louis Dionne 2013-2017
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