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/*!
@file
Defines `boost::hana::Ring`.
@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_CONCEPT_RING_HPP
#define BOOST_HANA_CONCEPT_RING_HPP
#include <boost/hana/fwd/concept/ring.hpp>
#include <boost/hana/config.hpp>
#include <boost/hana/core/default.hpp>
#include <boost/hana/core/tag_of.hpp>
#include <boost/hana/detail/integral_constant.hpp>
#include <boost/hana/mult.hpp>
#include <boost/hana/one.hpp>
BOOST_HANA_NAMESPACE_BEGIN
template <typename R>
struct Ring
: hana::integral_constant<bool,
!is_default<one_impl<typename tag_of<R>::type>>::value &&
!is_default<mult_impl<typename tag_of<R>::type,
typename tag_of<R>::type>>::value
>
{ };
BOOST_HANA_NAMESPACE_END
#endif // !BOOST_HANA_CONCEPT_RING_HPP
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