| 1 | /*! |
|---|
| 2 | @file |
|---|
| 3 | Defines `boost::hana::erase_key`. |
|---|
| 4 | |
|---|
| 5 | Copyright Louis Dionne 2013-2022 |
|---|
| 6 | Distributed under the Boost Software License, Version 1.0. |
|---|
| 7 | (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt) |
|---|
| 8 | */ |
|---|
| 9 | |
|---|
| 10 | #ifndef BOOST_HANA_ERASE_KEY_HPP |
|---|
| 11 | #define BOOST_HANA_ERASE_KEY_HPP |
|---|
| 12 | |
|---|
| 13 | #include <boost/hana/fwd/erase_key.hpp> |
|---|
| 14 | |
|---|
| 15 | #include <boost/hana/config.hpp> |
|---|
| 16 | #include <boost/hana/core/dispatch.hpp> |
|---|
| 17 | |
|---|
| 18 | |
|---|
| 19 | namespace boost { namespace hana { |
|---|
| 20 | //! @cond |
|---|
| 21 | template <typename Set, typename ...Args> |
|---|
| 22 | constexpr decltype(auto) erase_key_t::operator()(Set&& set, Args&& ...args) const { |
|---|
| 23 | return erase_key_impl<typename hana::tag_of<Set>::type>::apply( |
|---|
| 24 | static_cast<Set&&>(set), |
|---|
| 25 | static_cast<Args&&>(args)... |
|---|
| 26 | ); |
|---|
| 27 | } |
|---|
| 28 | //! @endcond |
|---|
| 29 | |
|---|
| 30 | template <typename T, bool condition> |
|---|
| 31 | struct erase_key_impl<T, when<condition>> : default_ { |
|---|
| 32 | template <typename ...Args> |
|---|
| 33 | static constexpr auto apply(Args&& ...) = delete; |
|---|
| 34 | }; |
|---|
| 35 | }} // end namespace boost::hana |
|---|
| 36 | |
|---|
| 37 | #endif // !BOOST_HANA_ERASE_KEY_HPP |
|---|
| 38 | |
|---|
