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/*
* Copyright (C) 2013 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. AND ITS CONTRIBUTORS ``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 ITS 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 MallocPtr_h
#define MallocPtr_h
// MallocPtr is a smart pointer class that calls fastFree in its destructor.
// It is intended to be used for pointers where the C++ lifetime semantics
// (calling constructors and destructors) is not desired.
namespace WTF {
template<typename T> class MallocPtr {
public:
MallocPtr()
: m_ptr(nullptr)
{
}
MallocPtr(std::nullptr_t)
: m_ptr(nullptr)
{
}
MallocPtr(MallocPtr&& other)
: m_ptr(other.leakPtr())
{
}
~MallocPtr()
{
fastFree(m_ptr);
}
T* get() const
{
return m_ptr;
}
T *leakPtr() WARN_UNUSED_RETURN
{
return std::exchange(m_ptr, nullptr);
}
bool operator!() const
{
return !m_ptr;
}
MallocPtr& operator=(MallocPtr&& other)
{
MallocPtr ptr = WTFMove(other);
swap(ptr);
return *this;
}
void swap(MallocPtr& other)
{
std::swap(m_ptr, other.m_ptr);
}
template<typename U> friend MallocPtr<U> adoptMallocPtr(U*);
static MallocPtr malloc(size_t size)
{
MallocPtr mallocPtr;
mallocPtr.m_ptr = static_cast<T*>(fastMalloc(size));
return mallocPtr;
}
void realloc(size_t newSize)
{
m_ptr = static_cast<T*>(fastRealloc(m_ptr, newSize));
}
private:
explicit MallocPtr(T* ptr)
: m_ptr(ptr)
{
}
T* m_ptr;
};
template<typename U> MallocPtr<U> adoptMallocPtr(U* ptr)
{
return MallocPtr<U>(ptr);
}
} // namespace WTF
using WTF::MallocPtr;
using WTF::adoptMallocPtr;
#endif // MallocPtr_h
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