--- /dev/null
+/*
+ * 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 "Assertions.h"
+#include "NullPtr.h"
+#include "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) { }
+
+#if !defined(LOOSE_PASS_OWN_PTR) || !HAVE(NULLPTR)
+ PassOwnArrayPtr(std::nullptr_t) : m_ptr(0) { }
+#endif
+
+ // 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; }
+
+ void clear();
+ 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.
+#if COMPILER(WINSCW)
+ operator bool() const { return m_ptr; }
+#else
+ typedef PtrType PassOwnArrayPtr::*UnspecifiedBoolType;
+ operator UnspecifiedBoolType() const { return m_ptr ? &PassOwnArrayPtr::m_ptr : 0; }
+#endif
+
+ PassOwnArrayPtr& operator=(const PassOwnArrayPtr<T>&);
+#if !defined(LOOSE_PASS_OWN_ARRAY_PTR) || !HAVE(NULLPTR)
+ PassOwnArrayPtr& operator=(std::nullptr_t) { clear(); return *this; }
+#endif
+ template<typename U> PassOwnArrayPtr& operator=(const PassOwnArrayPtr<U>&);
+
+ template<typename U> friend PassOwnArrayPtr<U> adoptArrayPtr(U*);
+
+#ifdef LOOSE_PASS_OWN_ARRAY_PTR
+ PassOwnArrayPtr(PtrType ptr) : m_ptr(ptr) { }
+ PassOwnArrayPtr& operator=(PtrType);
+#endif
+
+private:
+#ifndef LOOSE_PASS_OWN_ARRAY_PTR
+ explicit PassOwnArrayPtr(PtrType ptr) : m_ptr(ptr) { }
+#endif
+
+ mutable PtrType m_ptr;
+};
+
+template<typename T> inline void PassOwnArrayPtr<T>::clear()
+{
+ PtrType ptr = m_ptr;
+ m_ptr = 0;
+ deleteOwnedArrayPtr(ptr);
+}
+
+template<typename T> inline typename PassOwnArrayPtr<T>::PtrType PassOwnArrayPtr<T>::leakPtr() const
+{
+ PtrType ptr = m_ptr;
+ m_ptr = 0;
+ return ptr;
+}
+
+#ifdef LOOSE_PASS_OWN_ARRAY_PTR
+template<typename T> inline PassOwnArrayPtr<T>& PassOwnArrayPtr<T>::operator=(PtrType optr)
+{
+ PtrType ptr = m_ptr;
+ m_ptr = optr;
+ ASSERT(!ptr || m_ptr != ptr);
+ if (ptr)
+ deleteOwnedArrayPtr(ptr);
+ return *this;
+}
+#endif
+
+template<typename T> inline PassOwnArrayPtr<T>& PassOwnArrayPtr<T>::operator=(const PassOwnArrayPtr<T>& optr)
+{
+ PtrType ptr = m_ptr;
+ m_ptr = optr.leakPtr();
+ ASSERT(!ptr || m_ptr != ptr);
+ if (ptr)
+ deleteOwnedArrayPtr(ptr);
+ return *this;
+}
+
+template<typename T> template<typename U> inline PassOwnArrayPtr<T>& PassOwnArrayPtr<T>::operator=(const PassOwnArrayPtr<U>& optr)
+{
+ PtrType ptr = m_ptr;
+ m_ptr = optr.leakPtr();
+ ASSERT(!ptr || m_ptr != ptr);
+ if (ptr)
+ deleteOwnedArrayPtr(ptr);
+ return *this;
+}
+
+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
projects / apple / javascriptcore.git / blobdiff