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/*!
@file
Defines arithmetic operators.
@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_DETAIL_OPERATORS_ARITHMETIC_HPP
#define BOOST_HANA_DETAIL_OPERATORS_ARITHMETIC_HPP
#include <boost/hana/config.hpp>
#include <boost/hana/core/tag_of.hpp>
#include <boost/hana/fwd/div.hpp>
#include <boost/hana/fwd/minus.hpp>
#include <boost/hana/fwd/mod.hpp>
#include <boost/hana/fwd/mult.hpp>
#include <boost/hana/fwd/negate.hpp>
#include <boost/hana/fwd/plus.hpp>
#include <type_traits>
BOOST_HANA_NAMESPACE_BEGIN namespace detail {
template <typename Tag>
struct arithmetic_operators {
static constexpr bool value = false;
};
namespace operators {
template <typename X, typename Y, typename = typename std::enable_if<
detail::arithmetic_operators<typename hana::tag_of<X>::type>::value ||
detail::arithmetic_operators<typename hana::tag_of<Y>::type>::value
>::type>
constexpr auto operator+(X&& x, Y&& y)
{ return hana::plus(static_cast<X&&>(x), static_cast<Y&&>(y)); }
template <typename X, typename Y, typename = typename std::enable_if<
detail::arithmetic_operators<typename hana::tag_of<X>::type>::value ||
detail::arithmetic_operators<typename hana::tag_of<Y>::type>::value
>::type>
constexpr auto operator-(X&& x, Y&& y)
{ return hana::minus(static_cast<X&&>(x), static_cast<Y&&>(y)); }
template <typename X, typename = typename std::enable_if<
detail::arithmetic_operators<typename hana::tag_of<X>::type>::value
>::type>
constexpr auto operator-(X&& x)
{ return hana::negate(static_cast<X&&>(x)); }
template <typename X, typename Y, typename = typename std::enable_if<
detail::arithmetic_operators<typename hana::tag_of<X>::type>::value ||
detail::arithmetic_operators<typename hana::tag_of<Y>::type>::value
>::type>
constexpr auto operator*(X&& x, Y&& y)
{ return hana::mult(static_cast<X&&>(x), static_cast<Y&&>(y)); }
template <typename X, typename Y, typename = typename std::enable_if<
detail::arithmetic_operators<typename hana::tag_of<X>::type>::value ||
detail::arithmetic_operators<typename hana::tag_of<Y>::type>::value
>::type>
constexpr auto operator/(X&& x, Y&& y)
{ return hana::div(static_cast<X&&>(x), static_cast<Y&&>(y)); }
template <typename X, typename Y, typename = typename std::enable_if<
detail::arithmetic_operators<typename hana::tag_of<X>::type>::value ||
detail::arithmetic_operators<typename hana::tag_of<Y>::type>::value
>::type>
constexpr auto operator%(X&& x, Y&& y)
{ return hana::mod(static_cast<X&&>(x), static_cast<Y&&>(y)); }
} // end namespace operators
} BOOST_HANA_NAMESPACE_END
#endif // !BOOST_HANA_DETAIL_OPERATORS_ARITHMETIC_HPP
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