// Copyright 2016 PDFium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef CORE_FXCRT_INCLUDE_CFX_RETAIN_PTR_H_
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#define CORE_FXCRT_INCLUDE_CFX_RETAIN_PTR_H_
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#include <memory>
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#include "core/fxcrt/include/fx_memory.h"
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template <class T>
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class CFX_RetainPtr {
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public:
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explicit CFX_RetainPtr(T* pObj) : m_pObj(pObj) {
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if (m_pObj)
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m_pObj->Retain();
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}
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CFX_RetainPtr() : CFX_RetainPtr(nullptr) {}
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CFX_RetainPtr(const CFX_RetainPtr& that) : CFX_RetainPtr(that.Get()) {}
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CFX_RetainPtr(CFX_RetainPtr&& that) { Swap(that); }
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template <class U>
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CFX_RetainPtr(const CFX_RetainPtr<U>& that)
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: CFX_RetainPtr(that.Get()) {}
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void Reset(T* obj = nullptr) {
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if (obj)
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obj->Retain();
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m_pObj.reset(obj);
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}
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T* Get() const { return m_pObj.get(); }
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void Swap(CFX_RetainPtr& that) { m_pObj.swap(that.m_pObj); }
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CFX_RetainPtr& operator=(const CFX_RetainPtr& that) {
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if (*this != that)
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Reset(that.Get());
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return *this;
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}
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bool operator==(const CFX_RetainPtr& that) const {
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return Get() == that.Get();
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}
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bool operator!=(const CFX_RetainPtr& that) const { return !(*this == that); }
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operator bool() const { return !!m_pObj; }
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T& operator*() const { return *m_pObj.get(); }
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T* operator->() const { return m_pObj.get(); }
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private:
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std::unique_ptr<T, ReleaseDeleter<T>> m_pObj;
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};
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#endif // CORE_FXCRT_INCLUDE_CFX_RETAIN_PTR_H_
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