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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 {

 bool CallbackBase::is_null() const {

   return bind_state_.get() == NULL;

 }

 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_->HasOneRef());

 }

 CallbackBase::~CallbackBase() {

 }

 }  // namespace internal

 }  // namespace base