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106 lines
3.7 KiB
C++
106 lines
3.7 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd.
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** Contact: http://www.qt.io/licensing/
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**
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** This file is part of the QtXmlPatterns module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see http://www.qt.io/terms-conditions. For further
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** information use the contact form at http://www.qt.io/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 or version 3 as published by the Free
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** Software Foundation and appearing in the file LICENSE.LGPLv21 and
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** LICENSE.LGPLv3 included in the packaging of this file. Please review the
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** following information to ensure the GNU Lesser General Public License
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** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** As a special exception, The Qt Company gives you certain additional
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** rights. These rights are described in The Qt Company LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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//
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// W A R N I N G
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// -------------
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//
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// This file is not part of the Qt API. It exists purely as an
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// implementation detail. This header file may change from version to
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// version without notice, or even be removed.
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//
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// We mean it.
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#ifndef QPatternist_ReferenceCountedValue_p_h
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#define QPatternist_ReferenceCountedValue_p_h
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QT_BEGIN_HEADER
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QT_BEGIN_NAMESPACE
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namespace QPatternist
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{
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/*!
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\class ReferenceCountedValue
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\internal
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\since 4.4
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\brief A template class that reference counts a value.
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This class is useful when an instance needs to have ownership semantics
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as if it was value based. A typical examples is a QObject pointer, which
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doesn't have a single owner.
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This is achieved through storing a copy of the object as
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a member inside ReferenceCountedValue, which never is copied. It will
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stay in scope until the last reference to the ReferenceCountedValue instance
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is removed, and subsequently ReferenceCountedValue is deleted and hence also
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the contained value. One should use ReferenceCountedValue by passing around
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copies of Ptr, which is a typedef for the QExplicitlySharedDataPointer
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smart pointer.
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*/
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template<typename T>
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class ReferenceCountedValue : public QSharedData
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{
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public:
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typedef QExplicitlySharedDataPointer<ReferenceCountedValue<T> > Ptr;
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inline ReferenceCountedValue(T *const v) : value(v)
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{
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}
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inline ~ReferenceCountedValue()
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{
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delete value;
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}
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T *const value;
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private:
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/*!
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Disabled, no implementation provided.
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*/
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inline ReferenceCountedValue();
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Q_DISABLE_COPY(ReferenceCountedValue)
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};
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}
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QT_END_NAMESPACE
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QT_END_HEADER
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#endif
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