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// Copyright 2017 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_UNOWNED_PTR_H_
#define CORE_FXCRT_CFX_UNOWNED_PTR_H_
#include <functional>
#include <memory>
#include <type_traits>
#include <utility>
#include "core/fxcrt/fx_memory.h"
template <class T>
class CFX_UnownedPtr {
public:
CFX_UnownedPtr() {}
CFX_UnownedPtr(const CFX_UnownedPtr& that) : CFX_UnownedPtr(that.Get()) {}
template <typename U>
explicit CFX_UnownedPtr(U* pObj) : m_pObj(pObj) {}
// Deliberately implicit to allow returning nullptrs.
// NOLINTNEXTLINE(runtime/explicit)
CFX_UnownedPtr(std::nullptr_t ptr) {}
#if defined(MEMORY_TOOL_REPLACES_ALLOCATOR)
~CFX_UnownedPtr() { Probe(); }
#endif
CFX_UnownedPtr& operator=(T* that) {
#if defined(MEMORY_TOOL_REPLACES_ALLOCATOR)
Probe();
#endif
m_pObj = that;
return *this;
}
CFX_UnownedPtr& operator=(const CFX_UnownedPtr& that) {
#if defined(MEMORY_TOOL_REPLACES_ALLOCATOR)
Probe();
#endif
if (*this != that)
m_pObj = that.Get();
return *this;
}
bool operator==(const CFX_UnownedPtr& that) const {
return Get() == that.Get();
}
bool operator==(const T* that) const { return Get() == that; }
bool operator!=(const CFX_UnownedPtr& that) const { return !(*this == that); }
bool operator!=(const T* that) const { return !(*this == that); }
bool operator<(const CFX_UnownedPtr& that) const {
return std::less<T*>()(Get(), that.Get());
}
T* Get() const { return m_pObj; }
explicit operator bool() const { return !!m_pObj; }
T& operator*() const { return *m_pObj; }
T* operator->() const { return m_pObj; }
private:
#if defined(MEMORY_TOOL_REPLACES_ALLOCATOR)
void Probe() {
if (m_pObj)
reinterpret_cast<volatile uint8_t*>(m_pObj)[0];
}
#endif
T* m_pObj = nullptr;
};
#endif // CORE_FXCRT_CFX_UNOWNED_PTR_H_
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