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OwnPtr.h
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1// -*- mode: c++; c-basic-offset: 4 -*-
2/*
3 * Copyright (C) 2006 Apple Computer, Inc.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public License
16 * along with this library; see the file COPYING.LIB. If not, write to
17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
19 *
20 */
21
22#ifndef WTF_OwnPtr_h
23#define WTF_OwnPtr_h
24
25#include <algorithm>
26#include "Assertions.h"
27#include "Noncopyable.h"
28
29namespace WTF {
30
31 template <typename T> class OwnPtr : Noncopyable {
32 public:
33 explicit OwnPtr(T* ptr = 0) : m_ptr(ptr) { }
34 ~OwnPtr() { safeDelete(); }
35
36 T* get() const { return m_ptr; }
37 T* release() { T* ptr = m_ptr; m_ptr = 0; return ptr; }
38
39 void set(T* ptr) { ASSERT(m_ptr != ptr); safeDelete(); m_ptr = ptr; }
40 void clear() { safeDelete(); m_ptr = 0; }
41
42 T& operator*() const { ASSERT(m_ptr); return *m_ptr; }
43 T* operator->() const { ASSERT(m_ptr); return m_ptr; }
44
45 bool operator!() const { return !m_ptr; }
46
47 // This conversion operator allows implicit conversion to bool but not to other integer types.
48 typedef T* (OwnPtr::*UnspecifiedBoolType)() const;
49 operator UnspecifiedBoolType() const { return m_ptr ? &OwnPtr::get : 0; }
50
51 void swap(OwnPtr& o) { std::swap(m_ptr, o.m_ptr); }
52
53 private:
54 void safeDelete() { typedef char known[sizeof(T) ? 1 : -1]; if (sizeof(known)) delete m_ptr; }
55
56 T* m_ptr;
57 };
58
59 template <typename T> inline void swap(OwnPtr<T>& a, OwnPtr<T>& b) { a.swap(b); }
60
61} // namespace WTF
62
63using WTF::OwnPtr;
64
65#endif // WTF_OwnPtr_h
Assertions.h
ASSERT
#define ASSERT(x)
Definition: Assertions.h:33
Noncopyable.h
WTFNoncopyable::Noncopyable
Definition: Noncopyable.h:32
WTF::OwnPtr
Definition: OwnPtr.h:31
WTF::OwnPtr::~OwnPtr
~OwnPtr()
Definition: OwnPtr.h:34
WTF::OwnPtr::get
T * get() const
Definition: OwnPtr.h:36
WTF::OwnPtr::release
T * release()
Definition: OwnPtr.h:37
WTF::OwnPtr::operator!
bool operator!() const
Definition: OwnPtr.h:45
WTF::OwnPtr::swap
void swap(OwnPtr &o)
Definition: OwnPtr.h:51
WTF::OwnPtr::operator->
T * operator->() const
Definition: OwnPtr.h:43
WTF::OwnPtr::OwnPtr
OwnPtr(T *ptr=0)
Definition: OwnPtr.h:33
WTF::OwnPtr::UnspecifiedBoolType
T *(OwnPtr::* UnspecifiedBoolType)() const
Definition: OwnPtr.h:48
WTF::OwnPtr::operator*
T & operator*() const
Definition: OwnPtr.h:42
WTF::OwnPtr::set
void set(T *ptr)
Definition: OwnPtr.h:39
WTF::OwnPtr::clear
void clear()
Definition: OwnPtr.h:40
WTF
Definition: ASCIICType.h:45
WTF::swap
void swap(OwnArrayPtr< T > &a, OwnArrayPtr< T > &b)
Definition: OwnArrayPtr.h:61
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