Initial import from the monolithic Qt.

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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 153 insertions, 0 deletions

diff --git a/src/corelib/kernel/qvariant_p.h b/src/corelib/kernel/qvariant_p.h
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+++ b/src/corelib/kernel/qvariant_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QVARIANT_P_H
+#define QVARIANT_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+// takes a type, returns the internal void* pointer cast
+// to a pointer of the input type
+
+#include <QtCore/qglobal.h>
+#include <QtCore/qvariant.h>
+
+QT_BEGIN_NAMESPACE
+
+#ifdef Q_CC_SUN // Sun CC picks the wrong overload, so introduce awful hack
+
+template <typename T>
+inline T *v_cast(const QVariant::Private *nd, T * = 0)
+{
+    QVariant::Private *d = const_cast<QVariant::Private *>(nd);
+    return ((sizeof(T) > sizeof(QVariant::Private::Data))
+            ? static_cast<T *>(d->data.shared->ptr)
+            : static_cast<T *>(static_cast<void *>(&d->data.c)));
+}
+
+#else // every other compiler in this world
+
+template <typename T>
+inline const T *v_cast(const QVariant::Private *d, T * = 0)
+{
+    return ((sizeof(T) > sizeof(QVariant::Private::Data))
+            ? static_cast<const T *>(d->data.shared->ptr)
+            : static_cast<const T *>(static_cast<const void *>(&d->data.c)));
+}
+
+template <typename T>
+inline T *v_cast(QVariant::Private *d, T * = 0)
+{
+    return ((sizeof(T) > sizeof(QVariant::Private::Data))
+            ? static_cast<T *>(d->data.shared->ptr)
+            : static_cast<T *>(static_cast<void *>(&d->data.c)));
+}
+
+#endif
+
+
+//a simple template that avoids to allocate 2 memory chunks when creating a QVariant
+template <class T> class QVariantPrivateSharedEx : public QVariant::PrivateShared
+{
+public:
+    QVariantPrivateSharedEx() : QVariant::PrivateShared(&m_t) { }
+    QVariantPrivateSharedEx(const T&t) : QVariant::PrivateShared(&m_t), m_t(t) { }
+
+private:
+    T m_t;
+};
+
+// constructs a new variant if copy is 0, otherwise copy-constructs
+template <class T>
+inline void v_construct(QVariant::Private *x, const void *copy, T * = 0)
+{
+    if (sizeof(T) > sizeof(QVariant::Private::Data)) {
+        x->data.shared = copy ? new QVariantPrivateSharedEx<T>(*static_cast<const T *>(copy))
+                              : new QVariantPrivateSharedEx<T>;
+        x->is_shared = true;
+    } else {
+        if (copy)
+            new (&x->data.ptr) T(*static_cast<const T *>(copy));
+        else
+            new (&x->data.ptr) T;
+    }
+}
+
+template <class T>
+inline void v_construct(QVariant::Private *x, const T &t)
+{
+    if (sizeof(T) > sizeof(QVariant::Private::Data)) {
+        x->data.shared = new QVariantPrivateSharedEx<T>(t);
+        x->is_shared = true;
+    } else {
+        new (&x->data.ptr) T(t);
+    }
+}
+
+// deletes the internal structures
+template <class T>
+inline void v_clear(QVariant::Private *d, T* = 0)
+{
+    
+    if (sizeof(T) > sizeof(QVariant::Private::Data)) {
+        //now we need to cast
+        //because QVariant::PrivateShared doesn't have a virtual destructor
+        delete static_cast<QVariantPrivateSharedEx<T>*>(d->data.shared);
+    } else {
+        v_cast<T>(d)->~T();
+    }
+
+}
+
+Q_CORE_EXPORT const QVariant::Handler *qcoreVariantHandler();
+
+QT_END_NAMESPACE
+
+#endif // QVARIANT_P_H