41 lines
1.2 KiB
C++
41 lines
1.2 KiB
C++
/*!
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@file
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Defines operators for Iterables.
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@copyright Louis Dionne 2013-2017
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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*/
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#ifndef BOOST_HANA_DETAIL_OPERATORS_ITERABLE_HPP
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#define BOOST_HANA_DETAIL_OPERATORS_ITERABLE_HPP
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#include <boost/hana/config.hpp>
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#include <boost/hana/fwd/at.hpp>
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namespace boost { namespace hana { namespace detail {
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template <typename Derived>
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struct iterable_operators {
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template <typename N>
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constexpr decltype(auto) operator[](N&& n) & {
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return hana::at(static_cast<Derived&>(*this),
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static_cast<N&&>(n));
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}
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template <typename N>
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constexpr decltype(auto) operator[](N&& n) const& {
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return hana::at(static_cast<Derived const&>(*this),
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static_cast<N&&>(n));
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}
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template <typename N>
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constexpr decltype(auto) operator[](N&& n) && {
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return hana::at(static_cast<Derived&&>(*this),
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static_cast<N&&>(n));
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}
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};
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} }} // end namespace boost::hana
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#endif // !BOOST_HANA_DETAIL_OPERATORS_ITERABLE_HPP
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