ceph/src/boost/boost/hana/core/is_a.hpp

   1 /*!
   2 @file
   3 Defines `boost::hana::is_a` and `boost::hana::is_an`.
   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_CORE_IS_A_HPP
  11 #define BOOST_HANA_CORE_IS_A_HPP
  12
  13 #include <boost/hana/fwd/core/is_a.hpp>
  14
  15 #include <boost/hana/bool.hpp>
  16 #include <boost/hana/config.hpp>
  17 #include <boost/hana/core/tag_of.hpp>
  18
  19 #include <type_traits>
  20
  21
  22 BOOST_HANA_NAMESPACE_BEGIN
  23     //////////////////////////////////////////////////////////////////////////
  24     // is_a
  25     //////////////////////////////////////////////////////////////////////////
  26     template <typename DataType, typename T>
  27     struct is_a_t<DataType, T>
  28         : integral_constant<bool,
  29             std::is_same<DataType, typename hana::tag_of<T>::type>::value
  30         >
  31     { };
  32
  33     template <typename DataType>
  34     struct is_a_t<DataType> {
  35         template <typename T>
  36         constexpr auto operator()(T const&) const
  37         { return hana::is_a<DataType, T>; }
  38     };
  39 BOOST_HANA_NAMESPACE_END
  40
  41 #endif // !BOOST_HANA_CORE_IS_A_HPP