Menes/ObjectHandle.h

   1 /* Cydia - iPhone UIKit Front-End for Debian APT
   2  * Copyright (C) 2008-2011  Jay Freeman (saurik)
   3 */
   4
   5 /* Modified BSD License {{{ */
   6 /*
   7  *        Redistribution and use in source and binary
   8  * forms, with or without modification, are permitted
   9  * provided that the following conditions are met:
  10  *
  11  * 1. Redistributions of source code must retain the
  12  *    above copyright notice, this list of conditions
  13  *    and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the
  15  *    above copyright notice, this list of conditions
  16  *    and the following disclaimer in the documentation
  17  *    and/or other materials provided with the
  18  *    distribution.
  19  * 3. The name of the author may not be used to endorse
  20  *    or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS''
  24  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
  25  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  26  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
  28  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  29  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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  33  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  34  * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  35  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  36  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  37 */
  38 /* }}} */
  39
  40 #ifndef Menes_ObjectHandle_H
  41 #define Menes_ObjectHandle_H
  42
  43 #include "CyteKit/UCPlatform.h"
  44
  45 #include <CoreFoundation/CoreFoundation.h>
  46 #include <Foundation/Foundation.h>
  47
  48 template <typename Type_, unsigned Delegate_>
  49 struct MenesObjectHandle_;
  50
  51 template <typename Type_>
  52 struct MenesObjectHandle_<Type_, 0> {
  53     static _finline void Execute(Type_ *value) {
  54     }
  55 };
  56
  57 template <typename Type_>
  58 struct MenesObjectHandle_<Type_, 1> {
  59     static _finline void Execute(Type_ *value) {
  60         [value setDelegate:nil];
  61     }
  62 };
  63
  64 template <typename Type_>
  65 struct MenesObjectHandle_<Type_, 2> {
  66     static _finline void Execute(Type_ *value) {
  67         [value setDelegate:nil];
  68         [value setDataSource:nil];
  69     }
  70 };
  71
  72 template <typename Type_, unsigned Delegate_ = 0>
  73 class MenesObjectHandle {
  74   private:
  75     Type_ *value_;
  76
  77     _finline void Retain_() {
  78         if (value_ != nil)
  79             CFRetain((CFTypeRef) value_);
  80     }
  81
  82     _finline void Clear_() {
  83         if (value_ != nil) {
  84             MenesObjectHandle_<Type_, Delegate_>::Execute(value_);
  85             CFRelease((CFTypeRef) value_);
  86         }
  87     }
  88
  89   public:
  90     _finline MenesObjectHandle(const MenesObjectHandle &rhs) :
  91         value_(rhs.value_ == nil ? nil : (Type_ *) CFRetain((CFTypeRef) rhs.value_))
  92     {
  93     }
  94
  95     _finline MenesObjectHandle(Type_ *value = NULL, bool mended = false) :
  96         value_(value)
  97     {
  98         if (!mended)
  99             Retain_();
 100     }
 101
 102     _finline ~MenesObjectHandle() {
 103         Clear_();
 104     }
 105
 106     _finline operator Type_ *() const {
 107         return value_;
 108     }
 109
 110     _finline MenesObjectHandle &operator =(Type_ *value) {
 111         if (value_ != value) {
 112             Type_ *old(value_);
 113             value_ = value;
 114             Retain_();
 115             if (old != nil)
 116                 CFRelease((CFTypeRef) old);
 117         } return *this;
 118     }
 119
 120     _finline MenesObjectHandle &operator =(const MenesObjectHandle &value) {
 121         return this->operator =(value.operator Type_ *());
 122     }
 123 };
 124
 125 #define _H MenesObjectHandle
 126
 127 #endif//Menes_ObjectHandle_H