diff options
Diffstat (limited to 'src/concurrent/doc/snippets/code')
7 files changed, 695 insertions, 0 deletions
diff --git a/src/concurrent/doc/snippets/code/src_concurrent_qfuture.cpp b/src/concurrent/doc/snippets/code/src_concurrent_qfuture.cpp new file mode 100644 index 0000000000..ddf075b6ca --- /dev/null +++ b/src/concurrent/doc/snippets/code/src_concurrent_qfuture.cpp @@ -0,0 +1,64 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/ +** +** This file is part of the documentation of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** 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 Nokia Corporation and its Subsidiary(-ies) 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." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +//! [0] +QFuture<QString> future = ...; + +QFuture<QString>::const_iterator i; +for (i = future.constBegin(); i != future.constEnd(); ++i) + cout << *i << endl; +//! [0] + + +//! [1] +QFuture<QString> future; +... +QFutureIterator<QString> i(future); +while (i.hasNext()) + qDebug() << i.next(); +//! [1] + + +//! [2] +QFutureIterator<QString> i(future); +i.toBack(); +while (i.hasPrevious()) + qDebug() << i.previous(); +//! [2] diff --git a/src/concurrent/doc/snippets/code/src_concurrent_qfuturesynchronizer.cpp b/src/concurrent/doc/snippets/code/src_concurrent_qfuturesynchronizer.cpp new file mode 100644 index 0000000000..77003791e9 --- /dev/null +++ b/src/concurrent/doc/snippets/code/src_concurrent_qfuturesynchronizer.cpp @@ -0,0 +1,53 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/ +** +** This file is part of the documentation of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** 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 Nokia Corporation and its Subsidiary(-ies) 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." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +//! [0] +void someFunction() +{ + QFutureSynchronizer<void> synchronizer; + + ... + + synchronizer.addFuture(QtConcurrent::run(anotherFunction)); + synchronizer.addFuture(QtConcurrent::map(list, mapFunction)); + + return; // QFutureSynchronizer waits for all futures to finish +} +//! [0] diff --git a/src/concurrent/doc/snippets/code/src_concurrent_qfuturewatcher.cpp b/src/concurrent/doc/snippets/code/src_concurrent_qfuturewatcher.cpp new file mode 100644 index 0000000000..703275bc7a --- /dev/null +++ b/src/concurrent/doc/snippets/code/src_concurrent_qfuturewatcher.cpp @@ -0,0 +1,50 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/ +** +** This file is part of the documentation of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** 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 Nokia Corporation and its Subsidiary(-ies) 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." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +//! [0] +// Instantiate the objects and connect to the finished signal. +MyClass myObject; +QFutureWatcher<int> watcher; +connect(&watcher, SIGNAL(finished()), &myObject, SLOT(handleFinished())); + +// Start the computation. +QFuture<int> future = QtConcurrent::run(...); +watcher.setFuture(future); +//! [0] diff --git a/src/concurrent/doc/snippets/code/src_concurrent_qtconcurrentexception.cpp b/src/concurrent/doc/snippets/code/src_concurrent_qtconcurrentexception.cpp new file mode 100644 index 0000000000..cf0257c45b --- /dev/null +++ b/src/concurrent/doc/snippets/code/src_concurrent_qtconcurrentexception.cpp @@ -0,0 +1,75 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/ +** +** This file is part of the documentation of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** 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 Nokia Corporation and its Subsidiary(-ies) 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." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +//! [0] + +class MyException : public QtConcurrent::Exception +{ +public: + void raise() const { throw *this; } + Exception *clone() const { return new MyException(*this); } +}; + +//! [0] + + +//! [1] + +try { + QtConcurrent::blockingMap(list, throwFunction); // throwFunction throws MyException +} catch (MyException &e) { + // handle exception +} + +//! [1] + + +//! [2] + +void MyException::raise() const { throw *this; } + +//! [2] + + +//! [3] + +MyException *MyException::clone() const { return new MyException(*this); } + +//! [3] diff --git a/src/concurrent/doc/snippets/code/src_concurrent_qtconcurrentfilter.cpp b/src/concurrent/doc/snippets/code/src_concurrent_qtconcurrentfilter.cpp new file mode 100644 index 0000000000..2acf467e9a --- /dev/null +++ b/src/concurrent/doc/snippets/code/src_concurrent_qtconcurrentfilter.cpp @@ -0,0 +1,171 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/ +** +** This file is part of the documentation of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** 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 Nokia Corporation and its Subsidiary(-ies) 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." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +//! [0] +bool function(const T &t); +//! [0] + + +//! [1] +bool allLowerCase(const QString &string) +{ + return string.lowered() == string; +} + +QStringList strings = ...; +QFuture<QString> lowerCaseStrings = QtConcurrent::filtered(strings, allLowerCase); +//! [1] + + +//! [2] +QStringList strings = ...; +QFuture<void> future = QtConcurrent::filter(strings, allLowerCase); +//! [2] + + +//! [3] +V function(T &result, const U &intermediate) +//! [3] + + +//! [4] +void addToDictionary(QSet<QString> &dictionary, const QString &string) +{ + dictionary.insert(string); +} + +QStringList strings = ...; +QFuture<QSet<QString> > dictionary = QtConcurrent::filteredReduced(strings, allLowerCase, addToDictionary); +//! [4] + + +//! [5] +QStringList strings = ...; +QFuture<QString> lowerCaseStrings = QtConcurrent::filtered(strings.constBegin(), strings.constEnd(), allLowerCase); + +// filter in-place only works on non-const iterators +QFuture<void> future = QtConcurrent::filter(strings.begin(), strings.end(), allLowerCase); + +QFuture<QSet<QString> > dictionary = QtConcurrent::filteredReduced(strings.constBegin(), strings.constEnd(), allLowerCase, addToDictionary); +//! [5] + + +//! [6] +QStringList strings = ...; + +// each call blocks until the entire operation is finished +QStringList lowerCaseStrings = QtConcurrent::blockingFiltered(strings, allLowerCase); + + +QtConcurrent::blockingFilter(strings, allLowerCase); + +QSet<QString> dictionary = QtConcurrent::blockingFilteredReduced(strings, allLowerCase, addToDictionary); +//! [6] + + +//! [7] +// keep only images with an alpha channel +QList<QImage> images = ...; +QFuture<void> alphaImages = QtConcurrent::filter(strings, &QImage::hasAlphaChannel); + +// keep only gray scale images +QList<QImage> images = ...; +QFuture<QImage> grayscaleImages = QtConcurrent::filtered(images, &QImage::isGrayscale); + +// create a set of all printable characters +QList<QChar> characters = ...; +QFuture<QSet<QChar> > set = QtConcurrent::filteredReduced(characters, &QChar::isPrint, &QSet<QChar>::insert); +//! [7] + + +//! [8] +// can mix normal functions and member functions with QtConcurrent::filteredReduced() + +// create a dictionary of all lower cased strings +extern bool allLowerCase(const QString &string); +QStringList strings = ...; +QFuture<QSet<int> > averageWordLength = QtConcurrent::filteredReduced(strings, allLowerCase, QSet<QString>::insert); + +// create a collage of all gray scale images +extern void addToCollage(QImage &collage, const QImage &grayscaleImage); +QList<QImage> images = ...; +QFuture<QImage> collage = QtConcurrent::filteredReduced(images, &QImage::isGrayscale, addToCollage); +//! [8] + + +//! [9] +bool QString::contains(const QRegExp ®exp) const; +//! [9] + + +//! [10] +boost::bind(&QString::contains, QRegExp("^\\S+$")); // matches strings without whitespace +//! [10] + + +//! [11] +bool contains(const QString &string) +//! [11] + + +//! [12] +QStringList strings = ...; +boost::bind(static_cast<bool(QString::*)(const QRegExp&)>( &QString::contains ), QRegExp("..." )); +//! [12] + +//! [13] +struct StartsWith +{ + StartsWith(const QString &string) + : m_string(string) { } + + typedef bool result_type; + + bool operator()(const QString &testString) + { + return testString.startsWith(m_string); + } + + QString m_string; +}; + +QList<QString> strings = ...; +QFuture<QString> fooString = QtConcurrent::filtered(images, StartsWith(QLatin1String("Foo"))); +//! [13] diff --git a/src/concurrent/doc/snippets/code/src_concurrent_qtconcurrentmap.cpp b/src/concurrent/doc/snippets/code/src_concurrent_qtconcurrentmap.cpp new file mode 100644 index 0000000000..9b83ad5bef --- /dev/null +++ b/src/concurrent/doc/snippets/code/src_concurrent_qtconcurrentmap.cpp @@ -0,0 +1,184 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/ +** +** This file is part of the documentation of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** 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 Nokia Corporation and its Subsidiary(-ies) 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." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +//! [0] +U function(const T &t); +//! [0] + + +//! [1] +QImage scaled(const QImage &image) +{ + return image.scaled(100, 100); +} + +QList<QImage> images = ...; +QFuture<QImage> thumbnails = QtConcurrent::mapped(images, scaled); +//! [1] + + +//! [2] +U function(T &t); +//! [2] + + +//! [3] +void scale(QImage &image) +{ + image = image.scaled(100, 100); +} + +QList<QImage> images = ...; +QFuture<void> future = QtConcurrent::map(images, scale); +//! [3] + + +//! [4] +V function(T &result, const U &intermediate) +//! [4] + + +//! [5] +void addToCollage(QImage &collage, const QImage &thumbnail) +{ + QPainter p(&collage); + static QPoint offset = QPoint(0, 0); + p.drawImage(offset, thumbnail); + offset += ...; +} + +QList<QImage> images = ...; +QFuture<QImage> collage = QtConcurrent::mappedReduced(images, scaled, addToCollage); +//! [5] + + +//! [6] +QList<QImage> images = ...; + +QFuture<QImage> thumbnails = QtConcurrent::mapped(images.constBegin(), images.constEnd(), scaled); + +// map in-place only works on non-const iterators +QFuture<void> future = QtConcurrent::map(images.begin(), images.end(), scale); + +QFuture<QImage> collage = QtConcurrent::mappedReduced(images.constBegin(), images.constEnd(), scaled, addToCollage); +//! [6] + + +//! [7] +QList<QImage> images = ...; + +// each call blocks until the entire operation is finished +QList<QImage> future = QtConcurrent::blockingMapped(images, scaled); + +QtConcurrent::blockingMap(images, scale); + +QImage collage = QtConcurrent::blockingMappedReduced(images, scaled, addToCollage); +//! [7] + + +//! [8] +// squeeze all strings in a QStringList +QStringList strings = ...; +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); + +// create a set of the lengths of all strings in a list +QStringList strings = ...; +QFuture<QSet<int> > wordLengths = QtConcurrent::mappedReduced(string, &QString::length, &QSet<int>::insert); +//! [8] + + +//! [9] +// can mix normal functions and member functions with QtConcurrent::mappedReduced() + +// compute the average length of a list of strings +extern void computeAverage(int &average, int length); +QStringList strings = ...; +QFuture<int> averageWordLength = QtConcurrent::mappedReduced(strings, &QString::length, computeAverage); + +// 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); +//! [9] + + +//! [10] +QImage QImage::scaledToWidth(int width, Qt::TransformationMode) const; +//! [10] + + +//! [11] +boost::bind(&QImage::scaledToWidth, 100, Qt::SmoothTransformation) +//! [11] + + +//! [12] +QImage scaledToWith(const QImage &image) +//! [12] + + +//! [13] +QList<QImage> images = ...; +QFuture<QImage> thumbnails = QtConcurrent::mapped(images, boost::bind(&QImage::scaledToWidth, 100 Qt::SmoothTransformation)); +//! [13] + +//! [14] +struct Scaled +{ + Scaled(int size) + : m_size(size) { } + + typedef QImage result_type; + + QImage operator()(const QImage &image) + { + return image.scaled(m_size, m_size); + } + + int m_size; +}; + +QList<QImage> images = ...; +QFuture<QImage> thumbnails = QtConcurrent::mapped(images, Scaled(100)); +//! [14] diff --git a/src/concurrent/doc/snippets/code/src_concurrent_qtconcurrentrun.cpp b/src/concurrent/doc/snippets/code/src_concurrent_qtconcurrentrun.cpp new file mode 100644 index 0000000000..362f084092 --- /dev/null +++ b/src/concurrent/doc/snippets/code/src_concurrent_qtconcurrentrun.cpp @@ -0,0 +1,98 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/ +** +** This file is part of the documentation of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** 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 Nokia Corporation and its Subsidiary(-ies) 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." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +//! [0] +extern void aFunction(); +QFuture<void> future = QtConcurrent::run(aFunction); +//! [0] + + +//! [1] +extern void aFunctionWithArguments(int arg1, double arg2, const QString &string); + +int integer = ...; +double floatingPoint = ...; +QString string = ...; + +QFuture<void> future = QtConcurrent::run(aFunctionWithArguments, integer, floatingPoint, string); +//! [1] + + +//! [2] +extern QString functionReturningAString(); +QFuture<QString> future = QtConcurrent::run(functionReturningAString); +... +QString result = future.result(); +//! [2] + + +//! [3] +extern QString someFunction(const QByteArray &input); + +QByteArray bytearray = ...; + +QFuture<QString> future = QtConcurrent::run(someFunction, bytearray); +... +QString result = future.result(); +//! [3] + +//! [4] +// call 'QList<QByteArray> QByteArray::split(char sep) const' in a separate thread +QByteArray bytearray = "hello world"; +QFuture<QList<QByteArray> > future = QtConcurrent::run(bytearray, &QByteArray::split, ','); +... +QList<QByteArray> result = future.result(); +//! [4] + +//! [5] +// call 'void QImage::invertPixels(InvertMode mode)' in a separate thread +QImage image = ...; +QFuture<void> future = QtConcurrent::run(&image, &QImage::invertPixels, QImage::InvertRgba); +... +future.waitForFinished(); +// At this point, the pixels in 'image' have been inverted +//! [5] + + +//! [6] +void someFunction(int arg1, double arg2); +QFuture<void> future = QtConcurrent::run(boost::bind(someFunction, 1, 2.0)); +... +//! [6] |