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