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Diffstat (limited to 'boost/hana/erase_key.hpp')
-rw-r--r-- | boost/hana/erase_key.hpp | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/boost/hana/erase_key.hpp b/boost/hana/erase_key.hpp new file mode 100644 index 0000000000..20648f3c29 --- /dev/null +++ b/boost/hana/erase_key.hpp @@ -0,0 +1,37 @@ +/*! +@file +Defines `boost::hana::erase_key`. + +@copyright Louis Dionne 2013-2016 +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> + + +BOOST_HANA_NAMESPACE_BEGIN + //! @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; + }; +BOOST_HANA_NAMESPACE_END + +#endif // !BOOST_HANA_ERASE_KEY_HPP |