author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Mon, 04 Oct 2010 01:19:32 +0300 | |
changeset 37 | 758a864f9613 |
parent 18 | 2f34d5167611 |
permissions | -rw-r--r-- |
0 | 1 |
/**************************************************************************** |
2 |
** |
|
18
2f34d5167611
Revision: 201011
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
0
diff
changeset
|
3 |
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). |
0 | 4 |
** All rights reserved. |
5 |
** Contact: Nokia Corporation (qt-info@nokia.com) |
|
6 |
** |
|
7 |
** This file is part of the QtCore module of the Qt Toolkit. |
|
8 |
** |
|
9 |
** $QT_BEGIN_LICENSE:LGPL$ |
|
10 |
** No Commercial Usage |
|
11 |
** This file contains pre-release code and may not be distributed. |
|
12 |
** You may use this file in accordance with the terms and conditions |
|
13 |
** contained in the Technology Preview License Agreement accompanying |
|
14 |
** this package. |
|
15 |
** |
|
16 |
** GNU Lesser General Public License Usage |
|
17 |
** Alternatively, this file may be used under the terms of the GNU Lesser |
|
18 |
** General Public License version 2.1 as published by the Free Software |
|
19 |
** Foundation and appearing in the file LICENSE.LGPL included in the |
|
20 |
** packaging of this file. Please review the following information to |
|
21 |
** ensure the GNU Lesser General Public License version 2.1 requirements |
|
22 |
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
|
23 |
** |
|
24 |
** In addition, as a special exception, Nokia gives you certain additional |
|
25 |
** rights. These rights are described in the Nokia Qt LGPL Exception |
|
26 |
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
|
27 |
** |
|
28 |
** If you have questions regarding the use of this file, please contact |
|
29 |
** Nokia at qt-info@nokia.com. |
|
30 |
** |
|
31 |
** |
|
32 |
** |
|
33 |
** |
|
34 |
** |
|
35 |
** |
|
36 |
** |
|
37 |
** |
|
38 |
** $QT_END_LICENSE$ |
|
39 |
** |
|
40 |
****************************************************************************/ |
|
41 |
||
42 |
#ifndef QVARIANT_P_H |
|
43 |
#define QVARIANT_P_H |
|
44 |
||
45 |
// |
|
46 |
// W A R N I N G |
|
47 |
// ------------- |
|
48 |
// |
|
49 |
// This file is not part of the Qt API. It exists purely as an |
|
50 |
// implementation detail. This header file may change from version to |
|
51 |
// version without notice, or even be removed. |
|
52 |
// |
|
53 |
// We mean it. |
|
54 |
// |
|
55 |
||
56 |
// takes a type, returns the internal void* pointer cast |
|
57 |
// to a pointer of the input type |
|
58 |
||
59 |
#include <QtCore/qglobal.h> |
|
60 |
#include <QtCore/qvariant.h> |
|
61 |
||
62 |
QT_BEGIN_NAMESPACE |
|
63 |
||
64 |
#ifdef Q_CC_SUN // Sun CC picks the wrong overload, so introduce awful hack |
|
65 |
||
66 |
template <typename T> |
|
67 |
inline T *v_cast(const QVariant::Private *nd, T * = 0) |
|
68 |
{ |
|
69 |
QVariant::Private *d = const_cast<QVariant::Private *>(nd); |
|
70 |
return ((sizeof(T) > sizeof(QVariant::Private::Data)) |
|
71 |
? static_cast<T *>(d->data.shared->ptr) |
|
72 |
: static_cast<T *>(static_cast<void *>(&d->data.c))); |
|
73 |
} |
|
74 |
||
75 |
#else // every other compiler in this world |
|
76 |
||
77 |
template <typename T> |
|
78 |
inline const T *v_cast(const QVariant::Private *d, T * = 0) |
|
79 |
{ |
|
80 |
return ((sizeof(T) > sizeof(QVariant::Private::Data)) |
|
81 |
? static_cast<const T *>(d->data.shared->ptr) |
|
82 |
: static_cast<const T *>(static_cast<const void *>(&d->data.c))); |
|
83 |
} |
|
84 |
||
85 |
template <typename T> |
|
86 |
inline T *v_cast(QVariant::Private *d, T * = 0) |
|
87 |
{ |
|
88 |
return ((sizeof(T) > sizeof(QVariant::Private::Data)) |
|
89 |
? static_cast<T *>(d->data.shared->ptr) |
|
90 |
: static_cast<T *>(static_cast<void *>(&d->data.c))); |
|
91 |
} |
|
92 |
||
93 |
#endif |
|
94 |
||
95 |
||
96 |
//a simple template that avoids to allocate 2 memory chunks when creating a QVariant |
|
97 |
template <class T> class QVariantPrivateSharedEx : public QVariant::PrivateShared |
|
98 |
{ |
|
99 |
public: |
|
100 |
QVariantPrivateSharedEx() : QVariant::PrivateShared(&m_t) { } |
|
101 |
QVariantPrivateSharedEx(const T&t) : QVariant::PrivateShared(&m_t), m_t(t) { } |
|
102 |
||
103 |
private: |
|
104 |
T m_t; |
|
105 |
}; |
|
106 |
||
107 |
// constructs a new variant if copy is 0, otherwise copy-constructs |
|
108 |
template <class T> |
|
109 |
inline void v_construct(QVariant::Private *x, const void *copy, T * = 0) |
|
110 |
{ |
|
111 |
if (sizeof(T) > sizeof(QVariant::Private::Data)) { |
|
112 |
x->data.shared = copy ? new QVariantPrivateSharedEx<T>(*static_cast<const T *>(copy)) |
|
113 |
: new QVariantPrivateSharedEx<T>; |
|
114 |
x->is_shared = true; |
|
115 |
} else { |
|
116 |
if (copy) |
|
117 |
new (&x->data.ptr) T(*static_cast<const T *>(copy)); |
|
118 |
else |
|
119 |
new (&x->data.ptr) T; |
|
120 |
} |
|
121 |
} |
|
122 |
||
123 |
template <class T> |
|
124 |
inline void v_construct(QVariant::Private *x, const T &t) |
|
125 |
{ |
|
126 |
if (sizeof(T) > sizeof(QVariant::Private::Data)) { |
|
127 |
x->data.shared = new QVariantPrivateSharedEx<T>(t); |
|
128 |
x->is_shared = true; |
|
129 |
} else { |
|
130 |
new (&x->data.ptr) T(t); |
|
131 |
} |
|
132 |
} |
|
133 |
||
134 |
// deletes the internal structures |
|
135 |
template <class T> |
|
136 |
inline void v_clear(QVariant::Private *d, T* = 0) |
|
137 |
{ |
|
138 |
||
139 |
if (sizeof(T) > sizeof(QVariant::Private::Data)) { |
|
140 |
//now we need to cast |
|
141 |
//because QVariant::PrivateShared doesn't have a virtual destructor |
|
142 |
delete static_cast<QVariantPrivateSharedEx<T>*>(d->data.shared); |
|
143 |
} else { |
|
144 |
v_cast<T>(d)->~T(); |
|
145 |
} |
|
146 |
||
147 |
} |
|
148 |
||
149 |
Q_CORE_EXPORT const QVariant::Handler *qcoreVariantHandler(); |
|
150 |
||
151 |
QT_END_NAMESPACE |
|
152 |
||
153 |
#endif // QVARIANT_P_H |