|  | // 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 { | 
|  |  | 
|  | void BindStateBase::AddRef() { | 
|  | AtomicRefCountInc(&ref_count_); | 
|  | } | 
|  |  | 
|  | void BindStateBase::Release() { | 
|  | if (!AtomicRefCountDec(&ref_count_)) | 
|  | destructor_(this); | 
|  | } | 
|  |  | 
|  | CallbackBase::CallbackBase(const CallbackBase& c) = default; | 
|  | CallbackBase& CallbackBase::operator=(const CallbackBase& c) = default; | 
|  |  | 
|  | void CallbackBase::Reset() { | 
|  | polymorphic_invoke_ = NULL; | 
|  | // 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_ = NULL; | 
|  | } | 
|  |  | 
|  | bool CallbackBase::Equals(const CallbackBase& other) const { | 
|  | return bind_state_.get() == other.bind_state_.get() && | 
|  | polymorphic_invoke_ == other.polymorphic_invoke_; | 
|  | } | 
|  |  | 
|  | CallbackBase::CallbackBase(BindStateBase* bind_state) | 
|  | : bind_state_(bind_state), | 
|  | polymorphic_invoke_(NULL) { | 
|  | DCHECK(!bind_state_.get() || bind_state_->ref_count_ == 1); | 
|  | } | 
|  |  | 
|  | CallbackBase::~CallbackBase() { | 
|  | } | 
|  |  | 
|  | }  // namespace internal | 
|  | }  // namespace base |