text: /*!
  @file
  Defines `boost::hana::members`.
  
  @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_MEMBERS_HPP
  #define BOOST_HANA_MEMBERS_HPP
  
  #include <boost/hana/fwd/members.hpp>
  
  #include <boost/hana/accessors.hpp>
  #include <boost/hana/concept/struct.hpp>
  #include <boost/hana/config.hpp>
  #include <boost/hana/core/dispatch.hpp>
  #include <boost/hana/second.hpp>
  #include <boost/hana/transform.hpp>
  
  
  BOOST_HANA_NAMESPACE_BEGIN
      //! @cond
      template <typename Object>
      constexpr auto members_t::operator()(Object&& object) const {
          using S = typename hana::tag_of<Object>::type;
          using Members = BOOST_HANA_DISPATCH_IF(members_impl<S>,
              hana::Struct<S>::value
          );
  
          #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
              static_assert(hana::Struct<S>::value,
              "hana::members(object) requires 'object' to be a Struct");
          #endif
  
          return Members::apply(static_cast<Object&&>(object));
      }
      //! @endcond
  
      namespace struct_detail {
          template <typename Holder, typename Forward>
          struct members_helper {
              Holder object;
              template <typename Accessor>
              constexpr decltype(auto) operator()(Accessor&& accessor) const {
                  return hana::second(static_cast<Accessor&&>(accessor))(
                      static_cast<Forward>(object)
                  );
              }
          };
      }
  
      template <typename S, bool condition>
      struct members_impl<S, when<condition>> : default_ {
          template <typename Object>
          static constexpr auto apply(Object&& object) {
              return hana::transform(hana::accessors<S>(),
                  struct_detail::members_helper<Object&, Object&&>{object}
              );
          }
      };
  BOOST_HANA_NAMESPACE_END
  
  #endif // !BOOST_HANA_MEMBERS_HPP
  