82 lines
2.6 KiB
C++
82 lines
2.6 KiB
C++
//===-- CFUtils.h -----------------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Created by Greg Clayton on 3/5/07.
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//
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//===----------------------------------------------------------------------===//
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#ifndef __CFUtils_h__
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#define __CFUtils_h__
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#include <CoreFoundation/CoreFoundation.h>
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#ifdef __cplusplus
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//----------------------------------------------------------------------
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// Templatized CF helper class that can own any CF pointer and will
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// call CFRelease() on any valid pointer it owns unless that pointer is
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// explicitly released using the release() member function.
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//----------------------------------------------------------------------
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template <class T>
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class CFReleaser
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{
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public:
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// Type names for the avlue
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typedef T element_type;
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// Constructors and destructors
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CFReleaser(T ptr = NULL) : _ptr(ptr) { }
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CFReleaser(const CFReleaser& copy) : _ptr(copy.get())
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{
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if (get())
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::CFRetain(get());
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}
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virtual ~CFReleaser() { reset(); }
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// Assignments
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CFReleaser& operator= (const CFReleaser<T>& copy)
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{
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if (copy != *this)
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{
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// Replace our owned pointer with the new one
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reset(copy.get());
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// Retain the current pointer that we own
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if (get())
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::CFRetain(get());
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}
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}
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// Get the address of the contained type
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T * ptr_address() { return &_ptr; }
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// Access the pointer itself
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const T get() const { return _ptr; }
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T get() { return _ptr; }
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// Set a new value for the pointer and CFRelease our old
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// value if we had a valid one.
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void reset(T ptr = NULL)
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{
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if (ptr != _ptr)
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{
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if (_ptr != NULL)
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::CFRelease(_ptr);
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_ptr = ptr;
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}
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}
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// Release ownership without calling CFRelease
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T release() { T tmp = _ptr; _ptr = NULL; return tmp; }
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private:
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element_type _ptr;
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};
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#endif // #ifdef __cplusplus
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#endif // #ifndef __CFUtils_h__
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