Sprout/sprout/darkroom/access/access.hpp
2011-11-26 15:20:35 +09:00

48 lines
1.1 KiB
C++

#ifndef SPROUT_DARKROOM_ACCESS_ACCESS_HPP
#define SPROUT_DARKROOM_ACCESS_ACCESS_HPP
#include <cstddef>
#include <sprout/config.hpp>
#include <sprout/tuple/tuple.hpp>
#include <sprout/utility/forward.hpp>
namespace sprout {
namespace darkroom {
namespace access {
//
// element
//
template<std::size_t I, typename T>
struct element
: public sprout::tuples::tuple_element<I, T>
{};
//
// size
//
template<typename T>
struct size
: public sprout::tuples::tuple_size<T>
{};
//
// unit
//
template<typename T>
struct unit
: public sprout::darkroom::access::element<0, T>
{};
//
// get
//
template<std::size_t I, typename T>
SPROUT_CONSTEXPR auto get(
T&& t
) SPROUT_NOEXCEPT_EXPR(SPROUT_NOEXCEPT_EXPR(sprout::tuples::get<I>(sprout::forward<T>(t))))
-> decltype(sprout::tuples::get<I>(sprout::forward<T>(t)))
{
return sprout::tuples::get<I>(sprout::forward<T>(t));
}
} // namespace access
} // namespace darkroom
} // namespace sprout
#endif // #ifndef SPROUT_DARKROOM_ACCESS_ACCESS_HPP