base/callback_internal.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/callback_internal.h"
   6
   7 #include "base/logging.h"
   8
   9 namespace base {
  10 namespace internal {
  11
  12 void BindStateBase::AddRef() {
  13   AtomicRefCountInc(&ref_count_);
  14 }
  15
  16 void BindStateBase::Release() {
  17   if (!AtomicRefCountDec(&ref_count_))
  18     destructor_(this);
  19 }
  20
  21 CallbackBase::CallbackBase(const CallbackBase& c) = default;
  22 CallbackBase& CallbackBase::operator=(const CallbackBase& c) = default;
  23
  24 void CallbackBase::Reset() {
  25   polymorphic_invoke_ = NULL;
  26   // NULL the bind_state_ last, since it may be holding the last ref to whatever
  27   // object owns us, and we may be deleted after that.
  28   bind_state_ = NULL;
  29 }
  30
  31 bool CallbackBase::Equals(const CallbackBase& other) const {
  32   return bind_state_.get() == other.bind_state_.get() &&
  33          polymorphic_invoke_ == other.polymorphic_invoke_;
  34 }
  35
  36 CallbackBase::CallbackBase(BindStateBase* bind_state)
  37     : bind_state_(bind_state),
  38       polymorphic_invoke_(NULL) {
  39   DCHECK(!bind_state_.get() || bind_state_->ref_count_ == 1);
  40 }
  41
  42 CallbackBase::~CallbackBase() {
  43 }
  44
  45 }  // namespace internal
  46 }  // namespace base