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Diffstat (limited to 'src/3rdparty/javascriptcore/JavaScriptCore/wtf/PassOwnPtr.h')
| -rw-r--r-- | src/3rdparty/javascriptcore/JavaScriptCore/wtf/PassOwnPtr.h | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/src/3rdparty/javascriptcore/JavaScriptCore/wtf/PassOwnPtr.h b/src/3rdparty/javascriptcore/JavaScriptCore/wtf/PassOwnPtr.h new file mode 100644 index 000000000..ae7045786 --- /dev/null +++ b/src/3rdparty/javascriptcore/JavaScriptCore/wtf/PassOwnPtr.h @@ -0,0 +1,177 @@ +/* + * Copyright (C) 2009 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_PassOwnPtr_h +#define WTF_PassOwnPtr_h + +#include "Assertions.h" +#include "OwnPtrCommon.h" +#include "TypeTraits.h" + +namespace WTF { + + // Unlike most of our smart pointers, PassOwnPtr can take either the pointer type or the pointed-to type. + + template <typename T> class OwnPtr; + + template <typename T> class PassOwnPtr { + public: + typedef typename RemovePointer<T>::Type ValueType; + typedef ValueType* PtrType; + + PassOwnPtr(PtrType ptr = 0) : m_ptr(ptr) { } + // It somewhat breaks the type system to allow transfer of ownership out of + // a const PassOwnPtr. However, it makes it much easier to work with PassOwnPtr + // temporaries, and we don't really have a need to use real const PassOwnPtrs + // anyway. + PassOwnPtr(const PassOwnPtr& o) : m_ptr(o.release()) { } + template <typename U> PassOwnPtr(const PassOwnPtr<U>& o) : m_ptr(o.release()) { } + + ~PassOwnPtr() { deleteOwnedPtr(m_ptr); } + + PtrType get() const { return m_ptr; } + + void clear() { m_ptr = 0; } + PtrType release() const { PtrType ptr = m_ptr; m_ptr = 0; return ptr; } + + ValueType& 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 PassOwnPtr::*UnspecifiedBoolType; + operator UnspecifiedBoolType() const { return m_ptr ? &PassOwnPtr::m_ptr : 0; } + + PassOwnPtr& operator=(T*); + PassOwnPtr& operator=(const PassOwnPtr<T>&); + template <typename U> PassOwnPtr& operator=(const PassOwnPtr<U>&); + + private: + mutable PtrType m_ptr; + }; + + template <typename T> inline PassOwnPtr<T>& PassOwnPtr<T>::operator=(T* optr) + { + T* ptr = m_ptr; + m_ptr = optr; + ASSERT(!ptr || m_ptr != ptr); + if (ptr) + deleteOwnedPtr(ptr); + return *this; + } + + template <typename T> inline PassOwnPtr<T>& PassOwnPtr<T>::operator=(const PassOwnPtr<T>& optr) + { + T* ptr = m_ptr; + m_ptr = optr.release(); + ASSERT(!ptr || m_ptr != ptr); + if (ptr) + deleteOwnedPtr(ptr); + return *this; + } + + template <typename T> template <typename U> inline PassOwnPtr<T>& PassOwnPtr<T>::operator=(const PassOwnPtr<U>& optr) + { + T* ptr = m_ptr; + m_ptr = optr.release(); + ASSERT(!ptr || m_ptr != ptr); + if (ptr) + deleteOwnedPtr(ptr); + return *this; + } + + template <typename T, typename U> inline bool operator==(const PassOwnPtr<T>& a, const PassOwnPtr<U>& b) + { + return a.get() == b.get(); + } + + template <typename T, typename U> inline bool operator==(const PassOwnPtr<T>& a, const OwnPtr<U>& b) + { + return a.get() == b.get(); + } + + template <typename T, typename U> inline bool operator==(const OwnPtr<T>& a, const PassOwnPtr<U>& b) + { + return a.get() == b.get(); + } + + template <typename T, typename U> inline bool operator==(const PassOwnPtr<T>& a, U* b) + { + return a.get() == b; + } + + template <typename T, typename U> inline bool operator==(T* a, const PassOwnPtr<U>& b) + { + return a == b.get(); + } + + template <typename T, typename U> inline bool operator!=(const PassOwnPtr<T>& a, const PassOwnPtr<U>& b) + { + return a.get() != b.get(); + } + + template <typename T, typename U> inline bool operator!=(const PassOwnPtr<T>& a, const OwnPtr<U>& b) + { + return a.get() != b.get(); + } + + template <typename T, typename U> inline bool operator!=(const OwnPtr<T>& a, const PassOwnPtr<U>& b) + { + return a.get() != b.get(); + } + + template <typename T, typename U> inline bool operator!=(const PassOwnPtr<T>& a, U* b) + { + return a.get() != b; + } + + template <typename T, typename U> inline bool operator!=(T* a, const PassOwnPtr<U>& b) + { + return a != b.get(); + } + + template <typename T, typename U> inline PassOwnPtr<T> static_pointer_cast(const PassOwnPtr<U>& p) + { + return PassOwnPtr<T>(static_cast<T*>(p.release())); + } + + template <typename T, typename U> inline PassOwnPtr<T> const_pointer_cast(const PassOwnPtr<U>& p) + { + return PassOwnPtr<T>(const_cast<T*>(p.release())); + } + + template <typename T> inline T* getPtr(const PassOwnPtr<T>& p) + { + return p.get(); + } + +} // namespace WTF + +using WTF::PassOwnPtr; +using WTF::const_pointer_cast; +using WTF::static_pointer_cast; + +#endif // WTF_PassOwnPtr_h |