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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