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/*
* Copyright (C) 2015 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef WTF_NakedPtr_h
#define WTF_NakedPtr_h
#include <wtf/FastMalloc.h>
namespace WTF {
// The purpose of this class is to ensure that the wrapped pointer will never be
// used uninitialized.
template <typename T> class NakedPtr {
WTF_MAKE_FAST_ALLOCATED;
public:
ALWAYS_INLINE NakedPtr() : m_ptr(nullptr) { }
ALWAYS_INLINE NakedPtr(T* ptr) : m_ptr(ptr) { }
ALWAYS_INLINE NakedPtr(const NakedPtr& o) : m_ptr(o.m_ptr) { }
template<typename U> NakedPtr(const NakedPtr<U>& o) : m_ptr(o.get()) { }
ALWAYS_INLINE NakedPtr(NakedPtr&& o) : m_ptr(o.get()) { }
template<typename U> NakedPtr(NakedPtr<U>&& o) : m_ptr(o.get()) { }
T* get() const { return m_ptr; }
void clear() { m_ptr = nullptr; }
T& operator*() const { ASSERT(m_ptr); return *m_ptr; }
ALWAYS_INLINE T* operator->() const { return m_ptr; }
operator T*() { return m_ptr; }
bool operator!() const { return !m_ptr; }
explicit operator bool() const { return !!m_ptr; }
NakedPtr& operator=(const NakedPtr&);
NakedPtr& operator=(T*);
template<typename U> NakedPtr& operator=(const NakedPtr<U>&);
NakedPtr& operator=(NakedPtr&&);
template<typename U> NakedPtr& operator=(NakedPtr<U>&&);
void swap(NakedPtr&);
private:
T* m_ptr;
};
template<typename T> inline NakedPtr<T>& NakedPtr<T>::operator=(const NakedPtr& o)
{
m_ptr = o.m_ptr;
return *this;
}
template<typename T> inline NakedPtr<T>& NakedPtr<T>::operator=(T* optr)
{
m_ptr = optr;
return *this;
}
template<typename T> template<typename U> inline NakedPtr<T>& NakedPtr<T>::operator=(const NakedPtr<U>& o)
{
NakedPtr ptr = o;
swap(ptr);
return *this;
}
template<typename T> inline NakedPtr<T>& NakedPtr<T>::operator=(NakedPtr&& o)
{
NakedPtr ptr = WTFMove(o);
swap(ptr);
return *this;
}
template<typename T> template<typename U> inline NakedPtr<T>& NakedPtr<T>::operator=(NakedPtr<U>&& o)
{
NakedPtr ptr = WTFMove(o);
swap(ptr);
return *this;
}
template<class T> inline void NakedPtr<T>::swap(NakedPtr& o)
{
std::swap(m_ptr, o.m_ptr);
}
template<class T> inline void swap(NakedPtr<T>& a, NakedPtr<T>& b)
{
a.swap(b);
}
} // namespace WTF
using WTF::NakedPtr;
#endif // WTF_NakedPtr_h
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