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- /*!
- @file
- Forward declares `boost::hana::erase_key`.
- @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_ERASE_KEY_HPP
- #define BOOST_HANA_FWD_ERASE_KEY_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 T, typename = void>
- struct erase_key_impl : erase_key_impl<T, when<true>> { };
- //! @endcond
- struct erase_key_t {
- template <typename Set, typename ...Args>
- constexpr decltype(auto) operator()(Set&& set, Args&& ...args) const;
- };
- constexpr erase_key_t erase_key{};
- BOOST_HANA_NAMESPACE_END
- #endif // !BOOST_HANA_FWD_ERASE_KEY_HPP
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