text: /*!
  @file
  Defines `boost::hana::and_`.
  
  @copyright Louis Dionne 2013-2017
  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_AND_HPP
  #define BOOST_HANA_AND_HPP
  
  #include <boost/hana/fwd/and.hpp>
  
  #include <boost/hana/concept/logical.hpp>
  #include <boost/hana/config.hpp>
  #include <boost/hana/core/dispatch.hpp>
  #include <boost/hana/detail/variadic/foldl1.hpp>
  #include <boost/hana/if.hpp>
  
  
  namespace boost { namespace hana {
      //! @cond
      template <typename X, typename Y>
      constexpr decltype(auto) and_t::operator()(X&& x, Y&& y) const {
          using Bool = typename hana::tag_of<X>::type;
          using And = BOOST_HANA_DISPATCH_IF(and_impl<Bool>,
              hana::Logical<Bool>::value
          );
  
      #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
          static_assert(hana::Logical<Bool>::value,
          "hana::and_(x, y) requires 'x' to be a Logical");
      #endif
  
          return And::apply(static_cast<X&&>(x), static_cast<Y&&>(y));
      }
  
      template <typename X, typename ...Y>
      constexpr decltype(auto) and_t::operator()(X&& x, Y&& ...y) const {
          return detail::variadic::foldl1(
              *this,
              static_cast<X&&>(x),
              static_cast<Y&&>(y)...
          );
      }
      //! @endcond
  
      template <typename L, bool condition>
      struct and_impl<L, when<condition>> : default_ {
          template <typename X, typename Y>
          static constexpr decltype(auto) apply(X&& x, Y&& y) {
              return hana::if_(x, static_cast<Y&&>(y), x);
          }
      };
  }} // end namespace boost::hana
  
  #endif // !BOOST_HANA_AND_HPP
  