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// <experimental/synchronized_value> -*- C++ -*-
// Copyright The GNU Toolchain Authors.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
/** @file include/experimental/synchronized_value
* This is a TS C++ Library header.
* @ingroup libfund-ts
*/
#ifndef _GLIBCXX_EXPERIMENTAL_SYNCVAL
#define _GLIBCXX_EXPERIMENTAL_SYNCVAL 1
#ifdef _GLIBCXX_SYSHDR
#pragma GCC system_header
#endif
#include <bits/requires_hosted.h> // for std::mutex
#if __cplusplus >= 201703L
#include <mutex>
#include <bits/invoke.h>
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
namespace experimental::inline concurrency_v2
{
#define __cpp_lib_concurrency_v2_synchronized_value 202302
template<typename _Tp>
class synchronized_value
{
// TODO: Use partial specialization after PR c++/71954 is fixed.
template<typename... _Args>
static inline constexpr bool __is_self
= sizeof...(_Args) == 1
&& (is_same_v<__remove_cvref_t<_Args>, synchronized_value> && ...);
#if ! __cpp_concepts
template<typename... _Args>
using __not_self = bool_constant<!__is_self<_Args...>>;
#endif
public:
synchronized_value(const synchronized_value&) = delete;
synchronized_value& operator=(const synchronized_value&) = delete;
#if __cpp_concepts
template<typename... _Args>
requires (!__is_self<_Args...>) && is_constructible_v<_Tp, _Args...>
#else
template<typename... _Args, typename = _Require<__not_self<_Args...>>,
typename = _Require<is_constructible<_Tp, _Args...>>>
#endif
synchronized_value(_Args&&... __args)
noexcept(is_nothrow_constructible_v<_Tp, _Args...>)
: _M_val(std::forward<_Args>(__args)...)
{ }
template<typename _Fn, typename _Up, typename ... _Types>
friend invoke_result_t<_Fn, _Up&, _Types&...>
apply(_Fn&&, synchronized_value<_Up>&, synchronized_value<_Types>&...);
private:
mutex _M_mut;
_Tp _M_val;
};
template<typename _Fn, typename _Tp, typename... _Types>
inline invoke_result_t<_Fn, _Tp&, _Types&...>
apply(_Fn&& __f, synchronized_value<_Tp>& __val,
synchronized_value<_Types>&... __vals)
{
scoped_lock __l(__val._M_mut, __vals._M_mut...);
return std::__invoke(std::forward<_Fn>(__f), __val._M_val,
__vals._M_val...);
}
} // namespace experimental::concurrency_v2
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std
#endif // C++20
#endif // _GLIBCXX_EXPERIMENTAL_SYNCVAL
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