mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-12-27 21:45:42 +00:00
37 lines
1.4 KiB
C++
37 lines
1.4 KiB
C++
/*=============================================================================
|
|
Copyright (c) 2011-2019 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
|