text: /*!
  @file
  Defines operators for Iterables.
  
  @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_DETAIL_OPERATORS_ITERABLE_HPP
  #define BOOST_HANA_DETAIL_OPERATORS_ITERABLE_HPP
  
  #include <boost/hana/config.hpp>
  #include <boost/hana/fwd/at.hpp>
  
  
  BOOST_HANA_NAMESPACE_BEGIN namespace detail {
      template <typename Derived>
      struct iterable_operators {
          template <typename N>
          constexpr decltype(auto) operator[](N&& n) & {
              return hana::at(static_cast<Derived&>(*this),
                              static_cast<N&&>(n));
          }
  
          template <typename N>
          constexpr decltype(auto) operator[](N&& n) const& {
              return hana::at(static_cast<Derived const&>(*this),
                              static_cast<N&&>(n));
          }
  
          template <typename N>
          constexpr decltype(auto) operator[](N&& n) && {
              return hana::at(static_cast<Derived&&>(*this),
                              static_cast<N&&>(n));
          }
      };
  } BOOST_HANA_NAMESPACE_END
  
  #endif // !BOOST_HANA_DETAIL_OPERATORS_ITERABLE_HPP
  