ceph/src/boost/boost/hana/erase_key.hpp

   1 /*!
   2 @file
   3 Defines `boost::hana::erase_key`.
   4
   5 @copyright Louis Dionne 2013-2017
   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 BOOST_HANA_NAMESPACE_BEGIN
  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 BOOST_HANA_NAMESPACE_END
  36
  37 #endif // !BOOST_HANA_ERASE_KEY_HPP