--- /dev/null
+/*
+ * 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
projects / apple / javascriptcore.git / blobdiff