text: // 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_ || bind_state_->HasOneRef());
  }
  
  CallbackBase::~CallbackBase() {
  }
  
  }  // namespace internal
  }  // namespace base
  