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65 lines
2.1 KiB
C++
65 lines
2.1 KiB
C++
// -*- mode: c++; c-basic-offset: 4 -*-
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/*
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* Copyright (C) 2006 Apple Computer, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef WTF_OwnPtr_h
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#define WTF_OwnPtr_h
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#include <algorithm>
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#include "Assertions.h"
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#include "Noncopyable.h"
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namespace WTF {
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template <typename T> class OwnPtr : Noncopyable {
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public:
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explicit OwnPtr(T* ptr = 0) : m_ptr(ptr) { }
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~OwnPtr() { safeDelete(); }
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T* get() const { return m_ptr; }
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T* release() { T* ptr = m_ptr; m_ptr = 0; return ptr; }
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void set(T* ptr) { ASSERT(m_ptr != ptr); safeDelete(); m_ptr = ptr; }
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void clear() { safeDelete(); m_ptr = 0; }
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T& operator*() const { ASSERT(m_ptr); return *m_ptr; }
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T* operator->() const { ASSERT(m_ptr); return m_ptr; }
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bool operator!() const { return !m_ptr; }
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// This conversion operator allows implicit conversion to bool but not to other integer types.
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typedef T* (OwnPtr::*UnspecifiedBoolType)() const;
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operator UnspecifiedBoolType() const { return m_ptr ? &OwnPtr::get : 0; }
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void swap(OwnPtr& o) { std::swap(m_ptr, o.m_ptr); }
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private:
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void safeDelete() { typedef char known[sizeof(T) ? 1 : -1]; if (sizeof(known)) delete m_ptr; }
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T* m_ptr;
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};
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template <typename T> inline void swap(OwnPtr<T>& a, OwnPtr<T>& b) { a.swap(b); }
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} // namespace WTF
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using WTF::OwnPtr;
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#endif // WTF_OwnPtr_h
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