diff options
Diffstat (limited to 'doc/codesnippets/doc/src/snippets/qelapsedtimer/main.cpp')
-rw-r--r-- | doc/codesnippets/doc/src/snippets/qelapsedtimer/main.cpp | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/doc/codesnippets/doc/src/snippets/qelapsedtimer/main.cpp b/doc/codesnippets/doc/src/snippets/qelapsedtimer/main.cpp new file mode 100644 index 000000000..cae84e73a --- /dev/null +++ b/doc/codesnippets/doc/src/snippets/qelapsedtimer/main.cpp @@ -0,0 +1,109 @@ +/**************************************************************************** +** +** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the QtNetwork module 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." +** $QT_END_LICENSE$ +** +****************************************************************************/ +#include <QtCore> + +void slowOperation1() +{ + static char buf[256]; + for (int i = 0; i < (1<<20); ++i) + buf[i % sizeof buf] = i; +} + +void slowOperation2(int) { slowOperation1(); } + +void startExample() +{ +//![0] + timer = QElapsedTimer() + timer.start() + + slowOperation1() + + sys.stderr.write("The slow operation took" + timer.elapsed() + "milliseconds") +//![0] +} + +//![1] +def executeSlowOperations(timeout): + timer = QElapsedTimer() + timer.start() + slowOperation1() + + remainingTime = timeout - timer.elapsed() + if remainingTime > 0: + slowOperation2(remainingTime) +//![1] + +//![2] +def executeOperationsForTime(ms): + timer = QElapsedTimer() + timer.start() + + while not timer.hasExpired(ms): + slowOperation1() +//![2] + +int restartExample() +{ +//![3] + timer = QElapsedTimer() + + count = 1 + timer.start() + + while True: + count *= 2 + slowOperation2(count) + if timer.restart() < 250: + break + + return count +//![3] +} + +int main(int argc, char **argv) +{ + QCoreApplication app(argc, argv); + + startExample(); + restartExample(); + executeSlowOperations(5); + executeOperationsForTime(5); +} |