diff options
Diffstat (limited to 'src/concurrent/doc/snippets/code/src_concurrent_qtconcurrentmap.cpp')
| -rw-r--r-- | src/concurrent/doc/snippets/code/src_concurrent_qtconcurrentmap.cpp | 100 |
1 files changed, 44 insertions, 56 deletions
diff --git a/src/concurrent/doc/snippets/code/src_concurrent_qtconcurrentmap.cpp b/src/concurrent/doc/snippets/code/src_concurrent_qtconcurrentmap.cpp index fc574302d2..35345c6f24 100644 --- a/src/concurrent/doc/snippets/code/src_concurrent_qtconcurrentmap.cpp +++ b/src/concurrent/doc/snippets/code/src_concurrent_qtconcurrentmap.cpp @@ -1,52 +1,5 @@ -/**************************************************************************** -** -** Copyright (C) 2016 The Qt Company Ltd. -** Contact: https://www.qt.io/licensing/ -** -** This file is part of the documentation of the Qt Toolkit. -** -** $QT_BEGIN_LICENSE:BSD$ -** 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. -** -** BSD License Usage -** Alternatively, you may use this file under the terms of the BSD license -** as follows: -** -** "Redistribution and use in source and binary forms, with or without -** modification, are permitted provided that the following conditions are -** met: -** * Redistributions of source code must retain the above copyright -** notice, this list of conditions and the following disclaimer. -** * Redistributions in binary form must reproduce the above copyright -** notice, this list of conditions and the following disclaimer in -** the documentation and/or other materials provided with the -** distribution. -** * Neither the name of The Qt Company Ltd nor the names of its -** contributors may be used to endorse or promote products derived -** from this software without specific prior written permission. -** -** -** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT -** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR -** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT -** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, -** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT -** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, -** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY -** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE -** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." -** -** $QT_END_LICENSE$ -** -****************************************************************************/ +// Copyright (C) 2016 The Qt Company Ltd. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause //! [0] U function(const T &t); @@ -130,11 +83,13 @@ QFuture<void> squeezedStrings = QtConcurrent::map(strings, &QString::squeeze); // Swap the rgb values of all pixels on a list of images. QList<QImage> images = ...; -QFuture<QImage> bgrImages = QtConcurrent::mapped(images, &QImage::rgbSwapped); +QFuture<QImage> bgrImages = QtConcurrent::mapped(images, + static_cast<QImage (QImage::*)() const &>(&QImage::rgbSwapped)); // Create a set of the lengths of all strings in a list. QStringList strings = ...; -QFuture<QSet<int> > wordLengths = QtConcurrent::mappedReduced(strings, &QString::length, &QSet<int>::insert); +QFuture<QSet<int>> wordLengths = QtConcurrent::mappedReduced(strings, &QString::length, + qOverload<const int&>(&QSet<int>::insert)); //! [8] @@ -149,7 +104,8 @@ QFuture<int> averageWordLength = QtConcurrent::mappedReduced(strings, &QString:: // Create a set of the color distribution of all images in a list. extern int colorDistribution(const QImage &string); QList<QImage> images = ...; -QFuture<QSet<int> > totalColorDistribution = QtConcurrent::mappedReduced(images, colorDistribution, QSet<int>::insert); +QFuture<QSet<int>> totalColorDistribution = QtConcurrent::mappedReduced(images, colorDistribution, + qOverload<const int&>(&QSet<int>::insert)); //! [9] @@ -164,10 +120,8 @@ struct ImageTransform }; QFuture<QImage> thumbNails = - QtConcurrent::mappedReduced<QImage>(images, - Scaled(100), - ImageTransform(), - QtConcurrent::SequentialReduce); + QtConcurrent::mappedReduced(images, Scaled(100), ImageTransform(), + QtConcurrent::SequentialReduce); //! [11] //! [13] @@ -197,3 +151,37 @@ struct Scaled QList<QImage> images = ...; QFuture<QImage> thumbnails = QtConcurrent::mapped(images, Scaled(100)); //! [14] + +//! [15] +QList<int> vector { 1, 2, 3, 4 }; +QtConcurrent::blockingMap(vector, [](int &x) { x *= 2; }); + +int size = 100; +QList<QImage> images = ...; + +QList<QImage> thumbnails = QtConcurrent::mapped(images, + [&size](const QImage &image) { + return image.scaled(size, size); + } + ).results(); +//! [15] + +//! [16] +QList<QImage> collage = QtConcurrent::mappedReduced(images, + [&size](const QImage &image) { + return image.scaled(size, size); + }, + addToCollage + ).results(); +//! [16] + +//! [17] +QList<QImage> collage = QtConcurrent::mappedReduced(images, + [&size](const QImage &image) { + return image.scaled(size, size); + }, + [](QImage &result, const QImage &value) { + // do some transformation + } + ).results(); +//! [17] |