Move core/fxcrt/include to core/fxcrt

core/fxcrt/include/cfx_observable.h

-// 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_INCLUDE_CFX_OBSERVABLE_H_
-#define CORE_FXCRT_INCLUDE_CFX_OBSERVABLE_H_
-
-#include <set>
-
-#include "core/fxcrt/include/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_INCLUDE_CFX_OBSERVABLE_H_