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add subscript_at function

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bolero-MURAKAMI 2016-04-17 19:36:56 +09:00
parent 8278a2642c
commit 0080332dd5
12 changed files with 341 additions and 54 deletions
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37
sprout/detail/functional/const_subscript.hpp Normal file
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/*=============================================================================
Copyright (c) 2011-2016 Bolero MURAKAMI
https://github.com/bolero-MURAKAMI/Sprout
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
=============================================================================*/
#ifndef SPROUT_DETAIL_FUNCTIONAL_CONST_SUBSCRIPT_HPP
#define SPROUT_DETAIL_FUNCTIONAL_CONST_SUBSCRIPT_HPP
#include <utility>
#include <sprout/config.hpp>
#include <sprout/utility/forward.hpp>
#include <sprout/utility/as_const.hpp>
#include <sprout/functional/transparent.hpp>
namespace sprout {
namespace detail {
template<typename T = void>
struct const_subscript;
template<>
struct const_subscript<void>
: public sprout::transparent<>
{
public:
template<typename T, typename U>
SPROUT_CONSTEXPR decltype(std::declval<T>()[std::declval<U>()])
operator()(T&& x, U&& y)
const SPROUT_NOEXCEPT_IF_EXPR(const_cast<decltype(std::declval<T>()[std::declval<U>()])>(sprout::as_const(std::declval<T>())[std::declval<U>()]))
{
return const_cast<decltype(std::declval<T>()[std::declval<U>()])>(sprout::as_const(x)[SPROUT_FORWARD(U, y)]);
}
};
} // namespace detail
} // namespace sprout
#endif // #ifndef SPROUT_DETAIL_FUNCTIONAL_CONST_SUBSCRIPT_HPP