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 82
