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38 lines
1.4 KiB
C++
38 lines
1.4 KiB
C++
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/*=============================================================================
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Copyright (c) 2011-2016 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef SPROUT_DETAIL_FUNCTIONAL_CONST_SUBSCRIPT_HPP
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#define SPROUT_DETAIL_FUNCTIONAL_CONST_SUBSCRIPT_HPP
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#include <utility>
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#include <sprout/config.hpp>
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#include <sprout/utility/forward.hpp>
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#include <sprout/utility/as_const.hpp>
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#include <sprout/functional/transparent.hpp>
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namespace sprout {
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namespace detail {
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template<typename T = void>
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struct const_subscript;
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template<>
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struct const_subscript<void>
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: public sprout::transparent<>
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{
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public:
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template<typename T, typename U>
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SPROUT_CONSTEXPR decltype(std::declval<T>()[std::declval<U>()])
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operator()(T&& x, U&& y)
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const SPROUT_NOEXCEPT_IF_EXPR(const_cast<decltype(std::declval<T>()[std::declval<U>()])>(sprout::as_const(std::declval<T>())[std::declval<U>()]))
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{
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return const_cast<decltype(std::declval<T>()[std::declval<U>()])>(sprout::as_const(x)[SPROUT_FORWARD(U, y)]);
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}
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};
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} // namespace detail
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} // namespace sprout
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#endif // #ifndef SPROUT_DETAIL_FUNCTIONAL_CONST_SUBSCRIPT_HPP
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