mirror of
https://codeberg.org/ziglang/zig.git
synced 2025-12-06 22:04:21 +00:00
156ab87500
See: * https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc/77319 * https://discourse.llvm.org/t/rfc-project-hand-in-hand-llvm-libc-libc-code-sharing/77701 We're dropping support for C++03 for Zig due to the first change; it would be insane to ship 1018 duplicate header files just for this outdated use case. As a result of the second change, I had to bring in a subset of the headers from llvm-libc since libc++ now depends on these. Hopefully we can continue to get away with not copying the entirety of llvm-libc.
102 lines
3.7 KiB
C++
Vendored
102 lines
3.7 KiB
C++
Vendored
// -*- C++ -*-
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef _LIBCPP___STOP_TOKEN_STOP_CALLBACK_H
|
|
#define _LIBCPP___STOP_TOKEN_STOP_CALLBACK_H
|
|
|
|
#include <__concepts/constructible.h>
|
|
#include <__concepts/destructible.h>
|
|
#include <__concepts/invocable.h>
|
|
#include <__config>
|
|
#include <__stop_token/intrusive_shared_ptr.h>
|
|
#include <__stop_token/stop_state.h>
|
|
#include <__stop_token/stop_token.h>
|
|
#include <__type_traits/is_nothrow_constructible.h>
|
|
#include <__utility/forward.h>
|
|
#include <__utility/move.h>
|
|
#include <__utility/private_constructor_tag.h>
|
|
|
|
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
|
|
# pragma GCC system_header
|
|
#endif
|
|
|
|
_LIBCPP_PUSH_MACROS
|
|
#include <__undef_macros>
|
|
|
|
_LIBCPP_BEGIN_NAMESPACE_STD
|
|
|
|
#if _LIBCPP_STD_VER >= 20 && _LIBCPP_HAS_THREADS
|
|
|
|
template <class _Callback>
|
|
class _LIBCPP_AVAILABILITY_SYNC stop_callback : private __stop_callback_base {
|
|
static_assert(invocable<_Callback>,
|
|
"Mandates: stop_callback is instantiated with an argument for the template parameter Callback that "
|
|
"satisfies invocable.");
|
|
static_assert(destructible<_Callback>,
|
|
"Mandates: stop_callback is instantiated with an argument for the template parameter Callback that "
|
|
"satisfies destructible.");
|
|
|
|
public:
|
|
using callback_type = _Callback;
|
|
|
|
template <class _Cb>
|
|
requires constructible_from<_Callback, _Cb>
|
|
_LIBCPP_HIDE_FROM_ABI explicit stop_callback(const stop_token& __st,
|
|
_Cb&& __cb) noexcept(is_nothrow_constructible_v<_Callback, _Cb>)
|
|
: stop_callback(__private_constructor_tag{}, __st.__state_, std::forward<_Cb>(__cb)) {}
|
|
|
|
template <class _Cb>
|
|
requires constructible_from<_Callback, _Cb>
|
|
_LIBCPP_HIDE_FROM_ABI explicit stop_callback(stop_token&& __st,
|
|
_Cb&& __cb) noexcept(is_nothrow_constructible_v<_Callback, _Cb>)
|
|
: stop_callback(__private_constructor_tag{}, std::move(__st.__state_), std::forward<_Cb>(__cb)) {}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI ~stop_callback() {
|
|
if (__state_) {
|
|
__state_->__remove_callback(this);
|
|
}
|
|
}
|
|
|
|
stop_callback(const stop_callback&) = delete;
|
|
stop_callback(stop_callback&&) = delete;
|
|
stop_callback& operator=(const stop_callback&) = delete;
|
|
stop_callback& operator=(stop_callback&&) = delete;
|
|
|
|
private:
|
|
_LIBCPP_NO_UNIQUE_ADDRESS _Callback __callback_;
|
|
__intrusive_shared_ptr<__stop_state> __state_;
|
|
|
|
friend __stop_callback_base;
|
|
|
|
template <class _StatePtr, class _Cb>
|
|
_LIBCPP_HIDE_FROM_ABI explicit stop_callback(__private_constructor_tag, _StatePtr&& __state, _Cb&& __cb) noexcept(
|
|
is_nothrow_constructible_v<_Callback, _Cb>)
|
|
: __stop_callback_base([](__stop_callback_base* __cb_base) noexcept {
|
|
// stop callback is supposed to only be called once
|
|
std::forward<_Callback>(static_cast<stop_callback*>(__cb_base)->__callback_)();
|
|
}),
|
|
__callback_(std::forward<_Cb>(__cb)),
|
|
__state_() {
|
|
if (__state && __state->__add_callback(this)) {
|
|
// st.stop_requested() was false and this is successfully added to the linked list
|
|
__state_ = std::forward<_StatePtr>(__state);
|
|
}
|
|
}
|
|
};
|
|
|
|
template <class _Callback>
|
|
_LIBCPP_AVAILABILITY_SYNC stop_callback(stop_token, _Callback) -> stop_callback<_Callback>;
|
|
|
|
#endif // _LIBCPP_STD_VER >= 20 && _LIBCPP_HAS_THREADS
|
|
|
|
_LIBCPP_END_NAMESPACE_STD
|
|
|
|
_LIBCPP_POP_MACROS
|
|
|
|
#endif // _LIBCPP___STOP_TOKEN_STOP_CALLBACK_H
|