From 40736c5763bf61337c8c14e16d8587db021a87d4 Mon Sep 17 00:00:00 2001 From: Simon Hausmann Date: Fri, 6 Jan 2012 14:44:00 +0100 Subject: Imported WebKit commit 2ea9d364d0f6efa8fa64acf19f451504c59be0e4 (http://svn.webkit.org/repository/webkit/trunk@104285) --- Source/JavaScriptCore/wtf/PassOwnArrayPtr.h | 169 ++++++++++++++++++++++++++++ 1 file changed, 169 insertions(+) create mode 100644 Source/JavaScriptCore/wtf/PassOwnArrayPtr.h (limited to 'Source/JavaScriptCore/wtf/PassOwnArrayPtr.h') diff --git a/Source/JavaScriptCore/wtf/PassOwnArrayPtr.h b/Source/JavaScriptCore/wtf/PassOwnArrayPtr.h new file mode 100644 index 000000000..3748f18c6 --- /dev/null +++ b/Source/JavaScriptCore/wtf/PassOwnArrayPtr.h @@ -0,0 +1,169 @@ +/* + * 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 class OwnArrayPtr; +template class PassOwnArrayPtr; +template PassOwnArrayPtr adoptArrayPtr(T*); +template void deleteOwnedArrayPtr(T* ptr); + +template 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 PassOwnArrayPtr(const PassOwnArrayPtr& 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 friend PassOwnArrayPtr adoptArrayPtr(U*); + +private: + explicit PassOwnArrayPtr(PtrType ptr) : m_ptr(ptr) { } + + mutable PtrType m_ptr; +}; + +template inline typename PassOwnArrayPtr::PtrType PassOwnArrayPtr::leakPtr() const +{ + PtrType ptr = m_ptr; + m_ptr = 0; + return ptr; +} + +template inline bool operator==(const PassOwnArrayPtr& a, const PassOwnArrayPtr& b) +{ + return a.get() == b.get(); +} + +template inline bool operator==(const PassOwnArrayPtr& a, const OwnArrayPtr& b) +{ + return a.get() == b.get(); +} + +template inline bool operator==(const OwnArrayPtr& a, const PassOwnArrayPtr& b) +{ + return a.get() == b.get(); +} + +template inline bool operator==(const PassOwnArrayPtr& a, U* b) +{ + return a.get() == b; +} + +template inline bool operator==(T* a, const PassOwnArrayPtr& b) +{ + return a == b.get(); +} + +template inline bool operator!=(const PassOwnArrayPtr& a, const PassOwnArrayPtr& b) +{ + return a.get() != b.get(); +} + +template inline bool operator!=(const PassOwnArrayPtr& a, const OwnArrayPtr& b) +{ + return a.get() != b.get(); +} + +template inline bool operator!=(const OwnArrayPtr& a, const PassOwnArrayPtr& b) +{ + return a.get() != b.get(); +} + +template inline bool operator!=(const PassOwnArrayPtr& a, U* b) +{ + return a.get() != b; +} + +template inline bool operator!=(T* a, const PassOwnArrayPtr& b) +{ + return a != b.get(); +} + +template inline PassOwnArrayPtr adoptArrayPtr(T* ptr) +{ + return PassOwnArrayPtr(ptr); +} + +template inline void deleteOwnedArrayPtr(T* ptr) +{ + typedef char known[sizeof(T) ? 1 : -1]; + if (sizeof(known)) + delete [] ptr; +} + +template inline PassOwnArrayPtr static_pointer_cast(const PassOwnArrayPtr& p) +{ + return adoptArrayPtr(static_cast(p.leakPtr())); +} + +template inline PassOwnArrayPtr const_pointer_cast(const PassOwnArrayPtr& p) +{ + return adoptArrayPtr(const_cast(p.leakPtr())); +} + +template inline T* getPtr(const PassOwnArrayPtr& 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 -- cgit v1.2.1