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// Copyright (c) 2016-2020 Antony Polukhin // // 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 BOOST_PFR_DETAIL_RVALUE_T_HPP #define BOOST_PFR_DETAIL_RVALUE_T_HPP #pragma once #include <type_traits> #include <utility> // std::enable_if_t // This header provides aliases rvalue_t and lvalue_t. // // Usage: template <class T> void foo(rvalue<T> rvalue); // // Those are useful for // * better type safety - you can validate at compile time that only rvalue reference is passed into the function // * documentation and readability - rvalue_t<T> is much better than T&&+SFINAE namespace boost { namespace pfr { namespace detail { /// Binds to rvalues only, no copying allowed. template <class T #ifdef BOOST_PFR_DETAIL_STRICT_RVALUE_TESTING , class = std::enable_if_t<std::is_rvalue_reference<T&&>::value> #endif > using rvalue_t = T&&; /// Binds to mutable lvalues only }}} // namespace boost::pfr::detail #endif // BOOST_PFR_DETAIL_RVALUE_T_HPP
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