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// Copyright 2016 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CORE_FXCRT_CFX_OBSERVABLE_H_
#define CORE_FXCRT_CFX_OBSERVABLE_H_
#include <set>
#include "core/fxcrt/fx_system.h"
#include "third_party/base/stl_util.h"
template <class T>
class CFX_Observable {
public:
class ObservedPtr {
public:
ObservedPtr() : m_pObservedPtr(nullptr) {}
explicit ObservedPtr(T* pObservedPtr) : m_pObservedPtr(pObservedPtr) {
if (m_pObservedPtr)
m_pObservedPtr->AddObservedPtr(this);
}
ObservedPtr(const ObservedPtr& that) = delete;
~ObservedPtr() {
if (m_pObservedPtr)
m_pObservedPtr->RemoveObservedPtr(this);
}
void Reset(T* pObservedPtr = nullptr) {
if (m_pObservedPtr)
m_pObservedPtr->RemoveObservedPtr(this);
m_pObservedPtr = pObservedPtr;
if (m_pObservedPtr)
m_pObservedPtr->AddObservedPtr(this);
}
void OnDestroy() {
ASSERT(m_pObservedPtr);
m_pObservedPtr = nullptr;
}
ObservedPtr& operator=(const ObservedPtr& that) = delete;
bool operator==(const ObservedPtr& that) const {
return m_pObservedPtr == that.m_pObservedPtr;
}
bool operator!=(const ObservedPtr& that) const { return !(*this == that); }
explicit operator bool() const { return !!m_pObservedPtr; }
T* Get() const { return m_pObservedPtr; }
T& operator*() const { return *m_pObservedPtr; }
T* operator->() const { return m_pObservedPtr; }
private:
T* m_pObservedPtr;
};
CFX_Observable() {}
CFX_Observable(const CFX_Observable& that) = delete;
~CFX_Observable() { NotifyObservedPtrs(); }
void AddObservedPtr(ObservedPtr* pObservedPtr) {
ASSERT(!pdfium::ContainsKey(m_ObservedPtrs, pObservedPtr));
m_ObservedPtrs.insert(pObservedPtr);
}
void RemoveObservedPtr(ObservedPtr* pObservedPtr) {
ASSERT(pdfium::ContainsKey(m_ObservedPtrs, pObservedPtr));
m_ObservedPtrs.erase(pObservedPtr);
}
void NotifyObservedPtrs() {
for (auto* pObservedPtr : m_ObservedPtrs)
pObservedPtr->OnDestroy();
m_ObservedPtrs.clear();
}
CFX_Observable& operator=(const CFX_Observable& that) = delete;
protected:
size_t ActiveObservedPtrsForTesting() const { return m_ObservedPtrs.size(); }
private:
std::set<ObservedPtr*> m_ObservedPtrs;
};
#endif // CORE_FXCRT_CFX_OBSERVABLE_H_
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