lldb/tools/debugserver/source/MacOSX/CFUtils.h

   1 //===-- CFUtils.h -----------------------------------------------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 //  Created by Greg Clayton on 3/5/07.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #ifndef LLDB_TOOLS_DEBUGSERVER_SOURCE_MACOSX_CFUTILS_H
  14 #define LLDB_TOOLS_DEBUGSERVER_SOURCE_MACOSX_CFUTILS_H
  15
  16 #include <CoreFoundation/CoreFoundation.h>
  17
  18 #ifdef __cplusplus
  19
  20 // Templatized CF helper class that can own any CF pointer and will
  21 // call CFRelease() on any valid pointer it owns unless that pointer is
  22 // explicitly released using the release() member function.
  23 template <class T> class CFReleaser {
  24 public:
  25   // Type names for the value
  26   typedef T element_type;
  27
  28   // Constructors and destructors
  29   CFReleaser(T ptr = NULL) : _ptr(ptr) {}
  30   CFReleaser(const CFReleaser &copy) : _ptr(copy.get()) {
  31     if (get())
  32       ::CFRetain(get());
  33   }
  34   virtual ~CFReleaser() { reset(); }
  35
  36   // Assignments
  37   CFReleaser &operator=(const CFReleaser<T> &copy) {
  38     if (copy != *this) {
  39       // Replace our owned pointer with the new one
  40       reset(copy.get());
  41       // Retain the current pointer that we own
  42       if (get())
  43         ::CFRetain(get());
  44     }
  45   }
  46   // Get the address of the contained type
  47   T *ptr_address() { return &_ptr; }
  48
  49   // Access the pointer itself
  50   const T get() const { return _ptr; }
  51   T get() { return _ptr; }
  52
  53   // Set a new value for the pointer and CFRelease our old
  54   // value if we had a valid one.
  55   void reset(T ptr = NULL) {
  56     if (ptr != _ptr) {
  57       if (_ptr != NULL)
  58         ::CFRelease(_ptr);
  59       _ptr = ptr;
  60     }
  61   }
  62
  63   // Release ownership without calling CFRelease
  64   T release() {
  65     T tmp = _ptr;
  66     _ptr = NULL;
  67     return tmp;
  68   }
  69
  70 private:
  71   element_type _ptr;
  72 };
  73
  74 #endif // #ifdef __cplusplus
  75 #endif // LLDB_TOOLS_DEBUGSERVER_SOURCE_MACOSX_CFUTILS_H