observed_ptr.cpp

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// Copyright 2019 The PDFium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
#include "core/fxcrt/observed_ptr.h"
 
#include "third_party/base/check.h"
#include "third_party/base/containers/contains.h"
 
namespace fxcrt {
 
Observable::Observable() = default;
 
Observable::~Observable() {
  NotifyObservers();
}
 
void Observable::AddObserver(ObserverIface* pObserver) {
  DCHECK(!pdfium::Contains(m_Observers, pObserver));
  m_Observers.insert(pObserver);
}
 
void Observable::RemoveObserver(ObserverIface* pObserver) {
  DCHECK(pdfium::Contains(m_Observers, pObserver));
  m_Observers.erase(pObserver);
}
 
void Observable::NotifyObservers() {
  for (auto* pObserver : m_Observers)
    pObserver->OnObservableDestroyed();
  m_Observers.clear();
}
 
}  // namespace fxcrt