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// -*- 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 <__availability>
#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>
#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 && !defined(_LIBCPP_HAS_NO_EXPERIMENTAL_STOP_TOKEN) && !defined(_LIBCPP_HAS_NO_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_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_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;
struct __private_tag {};
template <class _StatePtr, class _Cb>
_LIBCPP_HIDE_FROM_ABI explicit stop_callback(__private_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_END_NAMESPACE_STD
_LIBCPP_POP_MACROS
#endif // _LIBCPP_STD_VER >= 20 && !defined(_LIBCPP_HAS_NO_EXPERIMENTAL_STOP_TOKEN) && !defined(_LIBCPP_HAS_NO_THREADS)
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