1 | /* |
2 | * Copyright (C) 2006 Apple Computer, Inc. |
3 | * |
4 | * This library is free software; you can redistribute it and/or |
5 | * modify it under the terms of the GNU Library General Public |
6 | * License as published by the Free Software Foundation; either |
7 | * version 2 of the License, or (at your option) any later version. |
8 | * |
9 | * This library is distributed in the hope that it will be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | * Library General Public License for more details. |
13 | * |
14 | * You should have received a copy of the GNU Library General Public License |
15 | * along with this library; see the file COPYING.LIB. If not, write to |
16 | * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
17 | * Boston, MA 02110-1301, USA. |
18 | * |
19 | */ |
20 | |
21 | #ifndef WTF_OwnArrayPtr_h |
22 | #define WTF_OwnArrayPtr_h |
23 | |
24 | #include <algorithm> |
25 | #include <wtf/Assertions.h> |
26 | #include <wtf/Noncopyable.h> |
27 | |
28 | namespace WTF { |
29 | |
30 | template <typename T> class OwnArrayPtr : public Noncopyable { |
31 | public: |
32 | explicit OwnArrayPtr(T* ptr = 0) : m_ptr(ptr) { } |
33 | ~OwnArrayPtr() { safeDelete(); } |
34 | |
35 | T* get() const { return m_ptr; } |
36 | T* release() { T* ptr = m_ptr; m_ptr = 0; return ptr; } |
37 | |
38 | void set(T* ptr) { ASSERT(m_ptr != ptr); safeDelete(); m_ptr = ptr; } |
39 | void clear() { safeDelete(); m_ptr = 0; } |
40 | |
41 | T& operator*() const { ASSERT(m_ptr); return *m_ptr; } |
42 | T* operator->() const { ASSERT(m_ptr); return m_ptr; } |
43 | |
44 | T& operator[](std::ptrdiff_t i) const { ASSERT(m_ptr); ASSERT(i >= 0); return m_ptr[i]; } |
45 | |
46 | bool operator!() const { return !m_ptr; } |
47 | |
48 | // This conversion operator allows implicit conversion to bool but not to other integer types. |
49 | #if COMPILER(WINSCW) |
50 | operator bool() const { return m_ptr; } |
51 | #else |
52 | typedef T* OwnArrayPtr::*UnspecifiedBoolType; |
53 | operator UnspecifiedBoolType() const { return m_ptr ? &OwnArrayPtr::m_ptr : 0; } |
54 | #endif |
55 | |
56 | void swap(OwnArrayPtr& o) { std::swap(m_ptr, o.m_ptr); } |
57 | |
58 | private: |
59 | void safeDelete() { typedef char known[sizeof(T) ? 1 : -1]; if (sizeof(known)) delete [] m_ptr; } |
60 | |
61 | T* m_ptr; |
62 | }; |
63 | |
64 | template <typename T> inline void swap(OwnArrayPtr<T>& a, OwnArrayPtr<T>& b) { a.swap(b); } |
65 | |
66 | template <typename T> inline T* getPtr(const OwnArrayPtr<T>& p) |
67 | { |
68 | return p.get(); |
69 | } |
70 | |
71 | } // namespace WTF |
72 | |
73 | using WTF::OwnArrayPtr; |
74 | |
75 | #endif // WTF_OwnArrayPtr_h |
76 | |