63e88f80
 Hu Chunming
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/*!
@file
Defines `boost::hana::erase_key`.
Copyright Louis Dionne 2013-2022
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_ERASE_KEY_HPP
#define BOOST_HANA_ERASE_KEY_HPP
#include <boost/hana/fwd/erase_key.hpp>
#include <boost/hana/config.hpp>
#include <boost/hana/core/dispatch.hpp>
namespace boost { namespace hana {
//! @cond
template <typename Set, typename ...Args>
constexpr decltype(auto) erase_key_t::operator()(Set&& set, Args&& ...args) const {
return erase_key_impl<typename hana::tag_of<Set>::type>::apply(
static_cast<Set&&>(set),
static_cast<Args&&>(args)...
);
}
//! @endcond
template <typename T, bool condition>
struct erase_key_impl<T, when<condition>> : default_ {
template <typename ...Args>
static constexpr auto apply(Args&& ...) = delete;
};
}} // end namespace boost::hana
#endif // !BOOST_HANA_ERASE_KEY_HPP
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