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
