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author | The Android Open Source Project <initial-contribution@android.com> | 2009-03-03 19:30:52 -0800 |
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committer | The Android Open Source Project <initial-contribution@android.com> | 2009-03-03 19:30:52 -0800 |
commit | 8e35f3cfc7fba1d1c829dc557ebad6409cbe16a2 (patch) | |
tree | 11425ea0b299d6fb89c6d3618a22d97d5bf68d0f /JavaScriptCore/wtf/RefCounted.h | |
parent | 648161bb0edfc3d43db63caed5cc5213bc6cb78f (diff) | |
download | external_webkit-8e35f3cfc7fba1d1c829dc557ebad6409cbe16a2.zip external_webkit-8e35f3cfc7fba1d1c829dc557ebad6409cbe16a2.tar.gz external_webkit-8e35f3cfc7fba1d1c829dc557ebad6409cbe16a2.tar.bz2 |
auto import from //depot/cupcake/@135843
Diffstat (limited to 'JavaScriptCore/wtf/RefCounted.h')
-rw-r--r-- | JavaScriptCore/wtf/RefCounted.h | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/JavaScriptCore/wtf/RefCounted.h b/JavaScriptCore/wtf/RefCounted.h new file mode 100644 index 0000000..2dd5b2a --- /dev/null +++ b/JavaScriptCore/wtf/RefCounted.h @@ -0,0 +1,107 @@ +/* + * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Library General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public License + * along with this library; see the file COPYING.LIB. If not, write to + * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, + * Boston, MA 02110-1301, USA. + * + */ + +#ifndef RefCounted_h +#define RefCounted_h + +#include <wtf/Assertions.h> +#include <wtf/Noncopyable.h> + +namespace WTF { + +// This base class holds the non-template methods and attributes. +// The RefCounted class inherits from it reducing the template bloat +// generated by the compiler (technique called template hoisting). +class RefCountedBase : Noncopyable { +public: + void ref() + { + ASSERT(!m_deletionHasBegun); + ++m_refCount; + } + + bool hasOneRef() const + { + ASSERT(!m_deletionHasBegun); + return m_refCount == 1; + } + + int refCount() const + { + return m_refCount; + } + +protected: + RefCountedBase(int initialRefCount) + : m_refCount(initialRefCount) +#ifndef NDEBUG + , m_deletionHasBegun(false) +#endif + { + } + + ~RefCountedBase() {} + + // Returns whether the pointer should be freed or not. + bool derefBase() + { + ASSERT(!m_deletionHasBegun); + ASSERT(m_refCount > 0); + if (m_refCount == 1) { +#ifndef NDEBUG + m_deletionHasBegun = true; +#endif + return true; + } + + --m_refCount; + return false; + } + +private: + int m_refCount; +#ifndef NDEBUG + bool m_deletionHasBegun; +#endif +}; + + +template<class T> class RefCounted : public RefCountedBase { +public: + RefCounted(int initialRefCount = 1) + : RefCountedBase(initialRefCount) + { + } + + void deref() + { + if (derefBase()) + delete static_cast<T*>(this); + } + +protected: + ~RefCounted() {} +}; + +} // namespace WTF + +using WTF::RefCounted; + +#endif // RefCounted_h |