// Copyright (c) 2016-2020 Antony Polukhin
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_PFR_DETAIL_RVALUE_T_HPP
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#define BOOST_PFR_DETAIL_RVALUE_T_HPP
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#pragma once
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#include <type_traits>
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#include <utility> // std::enable_if_t
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// This header provides aliases rvalue_t and lvalue_t.
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//
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// Usage: template <class T> void foo(rvalue<T> rvalue);
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//
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// Those are useful for
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// * better type safety - you can validate at compile time that only rvalue reference is passed into the function
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// * documentation and readability - rvalue_t<T> is much better than T&&+SFINAE
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namespace boost { namespace pfr { namespace detail {
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/// Binds to rvalues only, no copying allowed.
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template <class T
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#ifdef BOOST_PFR_DETAIL_STRICT_RVALUE_TESTING
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, class = std::enable_if_t<std::is_rvalue_reference<T&&>::value>
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#endif
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>
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using rvalue_t = T&&;
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/// Binds to mutable lvalues only
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}}} // namespace boost::pfr::detail
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#endif // BOOST_PFR_DETAIL_RVALUE_T_HPP
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