| 1 | // Copyright (c) 2016-2024 Antony Polukhin |
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| 2 | // |
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| 3 | // Distributed under the Boost Software License, Version 1.0. (See accompanying |
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| 4 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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| 5 | |
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| 6 | #ifndef BOOST_PFR_DETAIL_RVALUE_T_HPP |
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| 7 | #define BOOST_PFR_DETAIL_RVALUE_T_HPP |
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| 8 | #pragma once |
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| 9 | |
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| 10 | #include <type_traits> |
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| 11 | #include <utility> // std::enable_if_t |
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| 12 | |
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| 13 | // This header provides aliases rvalue_t and lvalue_t. |
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| 14 | // |
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| 15 | // Usage: template <class T> void foo(rvalue<T> rvalue); |
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| 16 | // |
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| 17 | // Those are useful for |
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| 18 | // * better type safety - you can validate at compile time that only rvalue reference is passed into the function |
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| 19 | // * documentation and readability - rvalue_t<T> is much better than T&&+SFINAE |
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| 20 | |
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| 21 | namespace boost { namespace pfr { namespace detail { |
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| 22 | |
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| 23 | /// Binds to rvalues only, no copying allowed. |
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| 24 | template <class T |
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| 25 | #ifdef BOOST_PFR_DETAIL_STRICT_RVALUE_TESTING |
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| 26 | , class = std::enable_if_t<std::is_rvalue_reference<T&&>::value> |
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| 27 | #endif |
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| 28 | > |
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| 29 | using rvalue_t = T&&; |
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| 30 | |
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| 31 | /// Binds to mutable lvalues only |
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| 32 | |
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| 33 | }}} // namespace boost::pfr::detail |
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| 34 | |
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| 35 | #endif // BOOST_PFR_DETAIL_RVALUE_T_HPP |
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| 36 | |
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