| Chris Lattner | 30fdc8d | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 1 | //===-- CFUtils.h -----------------------------------------------*- C++ -*-===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | // |
| 10 | // Created by Greg Clayton on 3/5/07. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
| 14 | #ifndef __CFUtils_h__ |
| 15 | #define __CFUtils_h__ |
| 16 | |
| 17 | #include <CoreFoundation/CoreFoundation.h> |
| 18 | |
| 19 | #ifdef __cplusplus |
| 20 | |
| 21 | //---------------------------------------------------------------------- |
| 22 | // Templatized CF helper class that can own any CF pointer and will |
| 23 | // call CFRelease() on any valid pointer it owns unless that pointer is |
| 24 | // explicitly released using the release() member function. |
| 25 | //---------------------------------------------------------------------- |
| 26 | template <class T> |
| 27 | class CFReleaser |
| 28 | { |
| 29 | public: |
| 30 | // Type names for the avlue |
| 31 | typedef T element_type; |
| 32 | |
| 33 | // Constructors and destructors |
| 34 | CFReleaser(T ptr = NULL) : _ptr(ptr) { } |
| 35 | CFReleaser(const CFReleaser& copy) : _ptr(copy.get()) |
| 36 | { |
| 37 | if (get()) |
| 38 | ::CFRetain(get()); |
| 39 | } |
| 40 | virtual ~CFReleaser() { reset(); } |
| 41 | |
| 42 | // Assignments |
| 43 | CFReleaser& operator= (const CFReleaser<T>& copy) |
| 44 | { |
| 45 | if (copy != *this) |
| 46 | { |
| 47 | // Replace our owned pointer with the new one |
| 48 | reset(copy.get()); |
| 49 | // Retain the current pointer that we own |
| 50 | if (get()) |
| 51 | ::CFRetain(get()); |
| 52 | } |
| 53 | } |
| 54 | // Get the address of the contained type |
| 55 | T * ptr_address() { return &_ptr; } |
| 56 | |
| 57 | // Access the pointer itself |
| 58 | const T get() const { return _ptr; } |
| 59 | T get() { return _ptr; } |
| 60 | |
| 61 | // Set a new value for the pointer and CFRelease our old |
| 62 | // value if we had a valid one. |
| 63 | void reset(T ptr = NULL) |
| 64 | { |
| 65 | if (ptr != _ptr) |
| 66 | { |
| 67 | if (_ptr != NULL) |
| 68 | ::CFRelease(_ptr); |
| 69 | _ptr = ptr; |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | // Release ownership without calling CFRelease |
| 74 | T release() { T tmp = _ptr; _ptr = NULL; return tmp; } |
| 75 | private: |
| 76 | element_type _ptr; |
| 77 | }; |
| 78 | |
| 79 | #endif // #ifdef __cplusplus |
| 80 | #endif // #ifndef __CFUtils_h__ |
| 81 | |