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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/callback_internal.h"
#include "base/logging.h"
namespace base {
namespace internal {
namespace {
bool QueryCancellationTraitsForNonCancellables(
const BindStateBase*,
BindStateBase::CancellationQueryMode mode) {
switch (mode) {
case BindStateBase::IS_CANCELLED:
return false;
case BindStateBase::MAYBE_VALID:
return true;
}
NOTREACHED();
return false;
}
} // namespace
void BindStateBaseRefCountTraits::Destruct(const BindStateBase* bind_state) {
bind_state->destructor_(bind_state);
}
BindStateBase::BindStateBase(InvokeFuncStorage polymorphic_invoke,
void (*destructor)(const BindStateBase*))
: BindStateBase(polymorphic_invoke,
destructor,
&QueryCancellationTraitsForNonCancellables) {}
BindStateBase::BindStateBase(
InvokeFuncStorage polymorphic_invoke,
void (*destructor)(const BindStateBase*),
bool (*query_cancellation_traits)(const BindStateBase*,
CancellationQueryMode))
: polymorphic_invoke_(polymorphic_invoke),
destructor_(destructor),
query_cancellation_traits_(query_cancellation_traits) {}
CallbackBase& CallbackBase::operator=(CallbackBase&& c) noexcept = default;
CallbackBase::CallbackBase(const CallbackBaseCopyable& c)
: bind_state_(c.bind_state_) {}
CallbackBase& CallbackBase::operator=(const CallbackBaseCopyable& c) {
bind_state_ = c.bind_state_;
return *this;
}
CallbackBase::CallbackBase(CallbackBaseCopyable&& c) noexcept
: bind_state_(std::move(c.bind_state_)) {}
CallbackBase& CallbackBase::operator=(CallbackBaseCopyable&& c) noexcept {
bind_state_ = std::move(c.bind_state_);
return *this;
}
void CallbackBase::Reset() {
// NULL the bind_state_ last, since it may be holding the last ref to whatever
// object owns us, and we may be deleted after that.
bind_state_ = nullptr;
}
bool CallbackBase::IsCancelled() const {
DCHECK(bind_state_);
return bind_state_->IsCancelled();
}
bool CallbackBase::MaybeValid() const {
DCHECK(bind_state_);
return bind_state_->MaybeValid();
}
bool CallbackBase::EqualsInternal(const CallbackBase& other) const {
return bind_state_ == other.bind_state_;
}
CallbackBase::~CallbackBase() = default;
CallbackBaseCopyable::CallbackBaseCopyable(const CallbackBaseCopyable& c) {
bind_state_ = c.bind_state_;
}
CallbackBaseCopyable& CallbackBaseCopyable::operator=(
const CallbackBaseCopyable& c) {
bind_state_ = c.bind_state_;
return *this;
}
CallbackBaseCopyable& CallbackBaseCopyable::operator=(
CallbackBaseCopyable&& c) noexcept = default;
} // namespace internal
} // namespace base
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