| /**************************************************************************** |
| ** |
| ** 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. |
| ** |
| ** $QT_BEGIN_LICENSE:LGPL$ |
| ** GNU Lesser General Public License Usage |
| ** 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 |
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| ** file. Please review the following information to ensure the GNU Lesser |
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| ** |
| ** 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. |
| ** |
| ** GNU General Public License Usage |
| ** Alternatively, this file may be used under the terms of the GNU General |
| ** Public License version 3.0 as published by the Free Software Foundation |
| ** and appearing in the file LICENSE.GPL included in the packaging of this |
| ** file. Please review the following information to ensure the GNU General |
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| ** Other Usage |
| ** Alternatively, this file may be used in accordance with the terms and |
| ** conditions contained in a signed written agreement between you and Nokia. |
| ** |
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| ** $QT_END_LICENSE$ |
| ** |
| ****************************************************************************/ |
| |
| #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 |