cpptoxml/parser/codemodel_pointer.h

   1 /****************************************************************************
   2 **
   3 ** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved.
   4 ** Copyright (C) 2006 Roberto Raggi <roberto@kdevelop.org>
   5 **
   6 ** This file is part of the Qt Script Generator project on Trolltech Labs.
   7 **
   8 ** This file may be used under the terms of the GNU General Public
   9 ** License version 2.0 as published by the Free Software Foundation
  10 ** and appearing in the file LICENSE.GPL included in the packaging of
  11 ** this file.  Please review the following information to ensure GNU
  12 ** General Public Licensing requirements will be met:
  13 ** http://www.trolltech.com/products/qt/opensource.html
  14 **
  15 ** If you are unsure which license is appropriate for your use, please
  16 ** review the following information:
  17 ** http://www.trolltech.com/products/qt/licensing.html or contact the
  18 ** sales department at sales@trolltech.com.
  19 **
  20 ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
  21 ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  22 **
  23 ****************************************************************************/
  24
  25 #ifndef CODEMODEL_POINTER_H
  26 #define CODEMODEL_POINTER_H
  27
  28 #include <QtCore/QSharedData>
  29
  30 // Since the atomic API changed in 4.4 we need to hack a little here
  31 // to make it work with both 4.3 and 4.4 until that is not required
  32
  33 #if QT_VERSION >= 0x040400
  34
  35 #   include <QtCore/qatomic.h>
  36 template <class T> class CodeModelPointer: public QAtomicPointer<T>
  37
  38 #else
  39
  40 template <class T> class CodeModelPointer
  41
  42 #endif // QT_VERSION >= 0x040400
  43
  44 {
  45 public:
  46     typedef T Type;
  47
  48 #if QT_VERSION < 0x040400
  49     inline T &operator*() { return *d; }
  50     inline const T &operator*() const { return *d; }
  51     inline T *operator->() { return d; }
  52     inline const T *operator->() const { return d; }
  53     inline operator T *() { return d; }
  54     inline operator const T *() const { return d; }
  55     inline T *data() { return d; }
  56     inline const T *data() const { return d; }
  57     inline const T *constData() const { return d; }
  58
  59     inline bool operator==(const CodeModelPointer<T> &other) const { return d == other.d; }
  60     inline bool operator!=(const CodeModelPointer<T> &other) const { return d != other.d; }
  61     inline bool operator==(const T *ptr) const { return d == ptr; }
  62     inline bool operator!=(const T *ptr) const { return d != ptr; }
  63
  64     inline CodeModelPointer() { d = 0; }
  65     inline ~CodeModelPointer() { if (d && !d->ref.deref()) delete d; }
  66
  67     explicit CodeModelPointer(T *data);
  68     inline CodeModelPointer(const CodeModelPointer<T> &o) : d(o.d) { if (d) d->ref.ref(); }
  69     inline CodeModelPointer<T> & operator=(const CodeModelPointer<T> &o) {
  70         if (o.d != d) {
  71             T *x = o.d;
  72             if (x) x->ref.ref();
  73             x = qAtomicSetPtr(&d, x);
  74             if (x && !x->ref.deref())
  75                 delete x;
  76         }
  77         return *this;
  78     }
  79     inline CodeModelPointer &operator=(T *o) {
  80         if (o != d) {
  81             T *x = o;
  82             if (x) x->ref.ref();
  83             x = qAtomicSetPtr(&d, x);
  84             if (x && !x->ref.deref())
  85                 delete x;
  86         }
  87         return *this;
  88     }
  89
  90     inline bool operator!() const { return !d; }
  91
  92 private:
  93     T *d;
  94 #else // QT_VERSION < 0x040400
  95     inline CodeModelPointer(T *value = 0) : QAtomicPointer<T>(value) {}
  96
  97     inline CodeModelPointer &operator=(T *o) {
  98         QAtomicPointer<T>::operator=(o);
  99         return *this;
 100     }
 101
 102     inline T *data() { return (T *) *this; }
 103     inline const T *data() const { return (const T *) *this; }
 104     inline const T *constData() const { return (const T *) *this; }
 105 #endif
 106 };
 107
 108 #if QT_VERSION < 0x040400
 109 template <class T>
 110 Q_INLINE_TEMPLATE CodeModelPointer<T>::CodeModelPointer(T *adata) : d(adata)
 111 { if (d) d->ref.ref(); }
 112 #endif
 113
 114 #endif // CODEMODEL_POINTER_H