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/*!
@file
Forward declares `boost::hana::difference`.
@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_FWD_DIFFERENCE_HPP
#define BOOST_HANA_FWD_DIFFERENCE_HPP
#include <boost/hana/config.hpp>
#include <boost/hana/core/when.hpp>
BOOST_HANA_NAMESPACE_BEGIN
// Note: This function is documented per datatype/concept only.
//! @cond
template <typename S, typename = void>
struct difference_impl : difference_impl<S, when<true>> { };
//! @endcond
struct difference_t {
template <typename Xs, typename Ys>
constexpr auto operator()(Xs&&, Ys&&) const;
};
constexpr difference_t difference{};
BOOST_HANA_NAMESPACE_END
#endif // !BOOST_HANA_FWD_DIFFERENCE_HPP