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/*! @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
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