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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.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#ifndef CORE_FXCRT_INCLUDE_CFX_COUNT_REF_H_
#define CORE_FXCRT_INCLUDE_CFX_COUNT_REF_H_
#include "core/fxcrt/include/cfx_retain_ptr.h"
#include "core/fxcrt/include/fx_system.h"
// A shared object with Copy on Write semantics that makes it appear as
// if each one were independent.
template <class ObjClass>
class CFX_CountRef {
public:
CFX_CountRef() {}
CFX_CountRef(const CFX_CountRef& other) : m_pObject(other.m_pObject) {}
~CFX_CountRef() {}
template <typename... Args>
ObjClass* Emplace(Args... params) {
m_pObject.Reset(new CountedObj(params...));
return m_pObject.Get();
}
CFX_CountRef& operator=(const CFX_CountRef& that) {
if (*this != that)
m_pObject = that.m_pObject;
return *this;
}
void SetNull() { m_pObject.Reset(); }
const ObjClass* GetObject() const { return m_pObject.Get(); }
template <typename... Args>
ObjClass* GetPrivateCopy(Args... params) {
if (!m_pObject)
return Emplace(params...);
if (!m_pObject->HasOneRef())
m_pObject.Reset(new CountedObj(*m_pObject));
return m_pObject.Get();
}
bool operator==(const CFX_CountRef& that) const {
return m_pObject == that.m_pObject;
}
bool operator!=(const CFX_CountRef& that) const { return !(*this == that); }
operator bool() const { return m_pObject; }
private:
class CountedObj : public ObjClass {
public:
template <typename... Args>
CountedObj(Args... params) : ObjClass(params...), m_RefCount(0) {}
CountedObj(const CountedObj& src) : ObjClass(src), m_RefCount(0) {}
bool HasOneRef() const { return m_RefCount == 1; }
void Retain() { m_RefCount++; }
void Release() {
if (--m_RefCount <= 0)
delete this;
}
private:
intptr_t m_RefCount;
};
CFX_RetainPtr<CountedObj> m_pObject;
};
#endif // CORE_FXCRT_INCLUDE_CFX_COUNT_REF_H_
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