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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
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