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/*!
@file
Defines `boost::hana::id`.
@copyright Louis Dionne 2013-2017
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
*/
#ifndef BOOST_HANA_FUNCTIONAL_ID_HPP
#define BOOST_HANA_FUNCTIONAL_ID_HPP
#include <boost/hana/config.hpp>
BOOST_HANA_NAMESPACE_BEGIN
//! @ingroup group-functional
//! The identity function -- returns its argument unchanged.
//!
//! ### Example
//! @include example/functional/id.cpp
#ifdef BOOST_HANA_DOXYGEN_INVOKED
constexpr auto id = [](auto&& x) -> decltype(auto) {
return forwarded(x);
};
#else
struct id_t {
template <typename T>
constexpr T operator()(T&& t) const {
return static_cast<T&&>(t);
}
};
constexpr id_t id{};
#endif
BOOST_HANA_NAMESPACE_END
#endif // !BOOST_HANA_FUNCTIONAL_ID_HPP