36 lines
1.0 KiB
C++
36 lines
1.0 KiB
C++
// Copyright (c) 2016-2022 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
|