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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
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