diff options
Diffstat (limited to 'src/declarative/qml/ftw/qhashfield_p.h')
-rw-r--r-- | src/declarative/qml/ftw/qhashfield_p.h | 120 |
1 files changed, 0 insertions, 120 deletions
diff --git a/src/declarative/qml/ftw/qhashfield_p.h b/src/declarative/qml/ftw/qhashfield_p.h deleted file mode 100644 index a11e8d9486..0000000000 --- a/src/declarative/qml/ftw/qhashfield_p.h +++ /dev/null @@ -1,120 +0,0 @@ -/**************************************************************************** -** -** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). -** Contact: http://www.qt-project.org/ -** -** This file is part of the QtDeclarative 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 -** 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. -** -** 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 -** Public License version 3.0 requirements will be met: -** http://www.gnu.org/copyleft/gpl.html. -** -** 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. -** -** -** -** -** -** -** $QT_END_LICENSE$ -** -****************************************************************************/ - -#ifndef QHASHFIELD_P_H -#define QHASHFIELD_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. -// - - -#include <QtCore/qglobal.h> - -QT_BEGIN_NAMESPACE - -// QHashField can be used for doing coarse grained set testing, in -// cases where you do not expect the set to contain the item. For -// example where you would write: -// QSet<QString> strings; -// for (int ii = 0; ii < mystrings.count(); ++ii) { -// if (strings.contains(mystrings.at(ii))) -// qFatal("Duplication!"); -// strings.insert(mystrings); -// } -// You may write: -// QHashField strings; -// for (int ii = 0; ii < mystrings.count(); ++ii) { -// if (strings.testAndSet(qHash(mystrings.at(ii)))) { -// // The string *might* be duplicated -// for (int jj = 0; jj < ii; ++jj) { -// if (mystrings.at(ii) == mystrings.at(jj)) -// qFatal("Duplication!"); -// } -// } -// } -// For small lists of things, where the hash is cheap to calculate -// and you don't expect duplication this will be much faster. -class QHashField { -public: - inline QHashField(); - - inline void clear(); - - inline bool test(quint32 hash); - inline bool testAndSet(quint32 hash); -private: - quint32 m_field; -}; - -QHashField::QHashField() -: m_field(0) -{ -} - -void QHashField::clear() -{ - m_field = 0; -} - -bool QHashField::test(quint32 hash) -{ - return m_field & (1 << (hash % 31)); -} - -bool QHashField::testAndSet(quint32 hash) -{ - quint32 mask = 1 << (hash % 31); - bool rv = m_field & mask; - m_field |= mask; - return rv; -} - -QT_END_NAMESPACE - -#endif // QHASHFIELD_P_H |