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/*
* Copyright (C) 2010 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_PassOwnArrayPtr_h
#define WTF_PassOwnArrayPtr_h
#include <wtf/Assertions.h>
#include <wtf/NullPtr.h>
#include <wtf/TypeTraits.h>
namespace WTF {
template<typename T> class OwnArrayPtr;
template<typename T> class PassOwnArrayPtr;
template<typename T> PassOwnArrayPtr<T> adoptArrayPtr(T*);
template<typename T> void deleteOwnedArrayPtr(T* ptr);
template<typename T> class PassOwnArrayPtr {
public:
typedef T* PtrType;
PassOwnArrayPtr() : m_ptr(0) { }
PassOwnArrayPtr(std::nullptr_t) : m_ptr(0) { }
// It somewhat breaks the type system to allow transfer of ownership out of
// a const PassOwnArrayPtr. However, it makes it much easier to work with PassOwnArrayPtr
// temporaries, and we don't have a need to use real const PassOwnArrayPtrs anyway.
PassOwnArrayPtr(const PassOwnArrayPtr& o) : m_ptr(o.leakPtr()) { }
template<typename U> PassOwnArrayPtr(const PassOwnArrayPtr<U>& o) : m_ptr(o.leakPtr()) { }
~PassOwnArrayPtr() { deleteOwnedArrayPtr(m_ptr); }
PtrType get() const { return m_ptr; }
PtrType leakPtr() const WARN_UNUSED_RETURN;
T& operator*() const { ASSERT(m_ptr); return *m_ptr; }
PtrType operator->() const { ASSERT(m_ptr); return m_ptr; }
bool operator!() const { return !m_ptr; }
// This conversion operator allows implicit conversion to bool but not to other integer types.
typedef PtrType PassOwnArrayPtr::*UnspecifiedBoolType;
operator UnspecifiedBoolType() const { return m_ptr ? &PassOwnArrayPtr::m_ptr : 0; }
PassOwnArrayPtr& operator=(const PassOwnArrayPtr&) { COMPILE_ASSERT(!sizeof(T*), PassOwnArrayPtr_should_never_be_assigned_to); return *this; }
template<typename U> friend PassOwnArrayPtr<U> adoptArrayPtr(U*);
private:
explicit PassOwnArrayPtr(PtrType ptr) : m_ptr(ptr) { }
mutable PtrType m_ptr;
};
template<typename T> inline typename PassOwnArrayPtr<T>::PtrType PassOwnArrayPtr<T>::leakPtr() const
{
PtrType ptr = m_ptr;
m_ptr = 0;
return ptr;
}
template<typename T, typename U> inline bool operator==(const PassOwnArrayPtr<T>& a, const PassOwnArrayPtr<U>& b)
{
return a.get() == b.get();
}
template<typename T, typename U> inline bool operator==(const PassOwnArrayPtr<T>& a, const OwnArrayPtr<U>& b)
{
return a.get() == b.get();
}
template<typename T, typename U> inline bool operator==(const OwnArrayPtr<T>& a, const PassOwnArrayPtr<U>& b)
{
return a.get() == b.get();
}
template<typename T, typename U> inline bool operator==(const PassOwnArrayPtr<T>& a, U* b)
{
return a.get() == b;
}
template<typename T, typename U> inline bool operator==(T* a, const PassOwnArrayPtr<U>& b)
{
return a == b.get();
}
template<typename T, typename U> inline bool operator!=(const PassOwnArrayPtr<T>& a, const PassOwnArrayPtr<U>& b)
{
return a.get() != b.get();
}
template<typename T, typename U> inline bool operator!=(const PassOwnArrayPtr<T>& a, const OwnArrayPtr<U>& b)
{
return a.get() != b.get();
}
template<typename T, typename U> inline bool operator!=(const OwnArrayPtr<T>& a, const PassOwnArrayPtr<U>& b)
{
return a.get() != b.get();
}
template<typename T, typename U> inline bool operator!=(const PassOwnArrayPtr<T>& a, U* b)
{
return a.get() != b;
}
template<typename T, typename U> inline bool operator!=(T* a, const PassOwnArrayPtr<U>& b)
{
return a != b.get();
}
template<typename T> inline PassOwnArrayPtr<T> adoptArrayPtr(T* ptr)
{
return PassOwnArrayPtr<T>(ptr);
}
template<typename T> inline void deleteOwnedArrayPtr(T* ptr)
{
typedef char known[sizeof(T) ? 1 : -1];
if (sizeof(known))
delete [] ptr;
}
template<typename T, typename U> inline PassOwnArrayPtr<T> static_pointer_cast(const PassOwnArrayPtr<U>& p)
{
return adoptArrayPtr(static_cast<T*>(p.leakPtr()));
}
template<typename T, typename U> inline PassOwnArrayPtr<T> const_pointer_cast(const PassOwnArrayPtr<U>& p)
{
return adoptArrayPtr(const_cast<T*>(p.leakPtr()));
}
template<typename T> inline T* getPtr(const PassOwnArrayPtr<T>& p)
{
return p.get();
}
} // namespace WTF
using WTF::PassOwnArrayPtr;
using WTF::adoptArrayPtr;
using WTF::const_pointer_cast;
using WTF::static_pointer_cast;
#endif // WTF_PassOwnArrayPtr_h
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