diff options
Diffstat (limited to 'src/corelib/doc/snippets/code/src_corelib_tools_qcontiguouscache.cpp')
-rw-r--r-- | src/corelib/doc/snippets/code/src_corelib_tools_qcontiguouscache.cpp | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/src/corelib/doc/snippets/code/src_corelib_tools_qcontiguouscache.cpp b/src/corelib/doc/snippets/code/src_corelib_tools_qcontiguouscache.cpp new file mode 100644 index 0000000000..6bc9604243 --- /dev/null +++ b/src/corelib/doc/snippets/code/src_corelib_tools_qcontiguouscache.cpp @@ -0,0 +1,59 @@ +/**************************************************************************** +** +** Copyright (C) 2018 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the QtCore module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 3 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL3 included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 3 requirements +** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 2.0 or (at your option) the GNU General +** Public license version 3 or any later version approved by the KDE Free +** Qt Foundation. The licenses are as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 +** included in the packaging of this file. Please review the following +** information to ensure the GNU General Public License requirements will +** be met: https://www.gnu.org/licenses/gpl-2.0.html and +** https://www.gnu.org/licenses/gpl-3.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +//! [0] +MyRecord record(int row) const +{ + Q_ASSERT(row >= 0 && row < count()); + + while (row > cache.lastIndex()) + cache.append(slowFetchRecord(cache.lastIndex()+1)); + while (row < cache.firstIndex()) + cache.prepend(slowFetchRecord(cache.firstIndex()-1)); + + return cache.at(row); +} +//! [0] + +//! [1] +QContiguousCache<int> cache(10); +cache.insert(INT_MAX, 1); // cache contains one value and has valid indexes, INT_MAX to INT_MAX +cache.append(2); // cache contains two values but does not have valid indexes. +cache.normalizeIndexes(); // cache has two values, 1 and 2. New first index will be in the range of 0 to capacity(). +//! [1] |