| 1 | /*! |
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| 2 | @file |
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| 3 | Defines operators for Iterables. |
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| 4 | |
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| 5 | Copyright Louis Dionne 2013-2022 |
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| 6 | Distributed under the Boost Software License, Version 1.0. |
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| 7 | (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt) |
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| 8 | */ |
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| 9 | |
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| 10 | #ifndef BOOST_HANA_DETAIL_OPERATORS_ITERABLE_HPP |
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| 11 | #define BOOST_HANA_DETAIL_OPERATORS_ITERABLE_HPP |
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| 12 | |
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| 13 | #include <boost/hana/config.hpp> |
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| 14 | #include <boost/hana/fwd/at.hpp> |
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| 15 | |
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| 16 | |
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| 17 | namespace boost { namespace hana { namespace detail { |
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| 18 | template <typename Derived> |
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| 19 | struct iterable_operators { |
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| 20 | template <typename N> |
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| 21 | constexpr decltype(auto) operator[](N&& n) & { |
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| 22 | return hana::at(static_cast<Derived&>(*this), |
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| 23 | static_cast<N&&>(n)); |
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| 24 | } |
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| 25 | |
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| 26 | template <typename N> |
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| 27 | constexpr decltype(auto) operator[](N&& n) const& { |
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| 28 | return hana::at(static_cast<Derived const&>(*this), |
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| 29 | static_cast<N&&>(n)); |
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| 30 | } |
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| 31 | |
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| 32 | template <typename N> |
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| 33 | constexpr decltype(auto) operator[](N&& n) && { |
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| 34 | return hana::at(static_cast<Derived&&>(*this), |
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| 35 | static_cast<N&&>(n)); |
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| 36 | } |
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| 37 | }; |
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| 38 | } }} // end namespace boost::hana |
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| 39 | |
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| 40 | #endif // !BOOST_HANA_DETAIL_OPERATORS_ITERABLE_HPP |
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| 41 | |
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