ClearScript/ClearScript/V8/ClearScriptV8/SharedPtr.h at master · orudge/ClearScript · GitHub

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// Licensed under the MIT license.

#pragma once

//-----------------------------------------------------------------------------

// SharedPtrTarget

//-----------------------------------------------------------------------------

class SharedPtrTarget

{

PROHIBIT_COPY(SharedPtrTarget)

public:

RefCount* GetRefCount()

{

return &m_RefCount;

}

protected:

class AddRefScope

{

PROHIBIT_COPY(AddRefScope)

PROHIBIT_HEAP(AddRefScope)

public:

explicit AddRefScope(RefCount* pRefCount):

m_pRefCount(pRefCount),

m_RefCountValue(pRefCount->Increment())

{

}

size_t GetRefCountValue() const

{

return m_RefCountValue;

}

~AddRefScope()

{

m_pRefCount->Decrement();

}

private:

RefCount* m_pRefCount;

size_t m_RefCountValue;

};

SharedPtrTarget():

m_RefCount(0)

{

}

private:

RefCount m_RefCount;

};

//-----------------------------------------------------------------------------

#define BEGIN_ADDREF_SCOPE \

{ \

__pragma(warning(disable:4456)) /* declaration hides previous local declaration */ \

AddRefScope t_AddRefScope(GetRefCount()); \

__pragma(warning(default:4456))

#define END_ADDREF_SCOPE \

IGNORE_UNUSED(t_AddRefScope); \

}

//-----------------------------------------------------------------------------

// SharedPtrTraits

//-----------------------------------------------------------------------------

template <typename T>

class SharedPtrTraits

{

PROHIBIT_CONSTRUCT(SharedPtrTraits)

public:

static void Destroy(T* pTarget)

{

delete pTarget;

}

};

//-----------------------------------------------------------------------------

// SharedPtr

//-----------------------------------------------------------------------------

template <typename T>

class SharedPtr

{

public:

SharedPtr<T>()

{

Initialize();

}

explicit SharedPtr<T>(nullptr_t)

{

Initialize();

}

explicit SharedPtr<T>(T* pTarget)

{

Initialize(pTarget);

}

SharedPtr<T>(const SharedPtr<T>& that)

{

CopyInitialize(that);

}

SharedPtr<T>(SharedPtr<T>&& that)

{

MoveInitialize(that);

}

template <typename TOther>

explicit SharedPtr<T>(const SharedPtr<TOther>& that)

{

CopyInitialize(that);

}

template <typename TOther>

explicit SharedPtr<T>(SharedPtr<TOther>&& that)

{

MoveInitialize(that);

}

const SharedPtr<T>& operator=(nullptr_t)

{

Empty();

return *this;

}

const SharedPtr<T>& operator=(T* pTarget)

{

SharedPtr<T> spHolder(m_pTarget, m_pRefCount);

Initialize(pTarget);

return *this;

}

const SharedPtr<T>& operator=(const SharedPtr<T>& that)

{

Copy(that);

return *this;

}

const SharedPtr<T>& operator=(SharedPtr<T>&& that)

{

Move(that);

return *this;

}

template <typename TOther>

const SharedPtr<T>& operator=(const SharedPtr<TOther>& that)

{

Copy(that);

return *this;

}

template <typename TOther>

const SharedPtr<T>& operator=(SharedPtr<TOther>&& that)

{

Move(that);

return *this;

}

T* operator->() const

{

_ASSERTE(m_pTarget != nullptr);

return m_pTarget;

}

operator T*() const

{

return m_pTarget;

}

T* GetRawPtr() const

{

return m_pTarget;

}

bool IsEmpty() const

{

return m_pTarget == nullptr;

}

void Empty()

{

SharedPtr<T> spHolder(std::move(*this));

}

~SharedPtr()

{

Release();

}

private:

SharedPtr<T>(T* pTarget, RefCount* pRefCount)

{

Initialize(pTarget, pRefCount);

}

void Initialize()

{

m_pTarget = nullptr;

m_pRefCount = nullptr;

}

void Initialize(T* pTarget)

{

m_pTarget = pTarget;

m_pRefCount = (m_pTarget != nullptr) ? AttachRefCount(m_pTarget) : nullptr;

}

void Initialize(T* pTarget, RefCount* pRefCount)

{

m_pTarget = pTarget;

m_pRefCount = pRefCount;

}

template <typename TOther>

void CopyInitialize(const SharedPtr<TOther>& that)

{

Initialize(that.m_pTarget, that.m_pRefCount);

AddRef();

}

template <typename TOther>

void MoveInitialize(SharedPtr<TOther>& that)

{

Initialize(that.m_pTarget, that.m_pRefCount);

that.Initialize();

}

template <typename TOther>

void Copy(const SharedPtr<TOther>& that)

{

SharedPtr<T> spHolder(m_pTarget, m_pRefCount);

CopyInitialize(that);

}

template <typename TOther>

void Move(SharedPtr<TOther>& that)

{

SharedPtr<T> spHolder(m_pTarget, m_pRefCount);

MoveInitialize(that);

}

void AddRef()

{

if (m_pTarget != nullptr)

{

_ASSERTE(m_pRefCount);

m_pRefCount->Increment();

}

void Release()

{

if (m_pTarget != nullptr)

{

T* pTarget = m_pTarget;

m_pTarget = nullptr;

RefCount* pRefCount = m_pRefCount;

m_pRefCount = nullptr;

_ASSERTE(pRefCount);

if (pRefCount->Decrement() == 0)

{

DetachRefCount(pTarget, pRefCount);

SharedPtrTraits<T>::Destroy(pTarget);

}

static RefCount* AttachRefCount(SharedPtrTarget* pTarget)

{

RefCount* pRefCount = pTarget->GetRefCount();

pRefCount->Increment();

return pRefCount;

}

static void DetachRefCount(SharedPtrTarget* /*pTarget*/, RefCount* /*pRefCount*/)

{

}

static RefCount* AttachRefCount(void* /*pvTarget*/)

{

return new RefCount(1);

}

static void DetachRefCount(void* /*pvTarget*/, RefCount* pRefCount)

{

delete pRefCount;

}

T* m_pTarget;

RefCount* m_pRefCount;

};

ClearScript/ClearScript/V8/ClearScriptV8/SharedPtr.h at master · orudge/ClearScript · GitHub

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