- Qt 5.5
- Qt Test
- Chapter 5: Writing a Benchmark
- benchmarking.cpp Example File
- Qt 5.5.1 Reference Documentation

# benchmarking.cpp Example File

tutorial5/benchmarking.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the examples 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 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."
    **
    ** $QT_END_LICENSE$
    **
    ****************************************************************************/

    #include <QtWidgets>
    #include <qtest.h>

    class TestBenchmark : public QObject
    {
        Q_OBJECT
    private slots:
        void simple();
        void multiple_data();
        void multiple();
        void series_data();
        void series();
    };

    void TestBenchmark::simple()
    {
        QString str1 = QLatin1String("This is a test string");
        QString str2 = QLatin1String("This is a test string");

        QCOMPARE(str1.localeAwareCompare(str2), 0);

        QBENCHMARK {
            str1.localeAwareCompare(str2);
        }
    }

    void TestBenchmark::multiple_data()
    {
        QTest::addColumn<bool>("useLocaleCompare");
        QTest::newRow("locale aware compare") << true;
        QTest::newRow("standard compare") << false;
    }

    void TestBenchmark::multiple()
    {
        QFETCH(bool, useLocaleCompare);
        QString str1 = QLatin1String("This is a test string");
        QString str2 = QLatin1String("This is a test string");

        int result;
        if (useLocaleCompare) {
            QBENCHMARK {
                result = str1.localeAwareCompare(str2);
            }
        } else {
            QBENCHMARK {
                result = (str1 == str2);
            }
        }
        Q_UNUSED(result);
    }

    void TestBenchmark::series_data()
    {
        QTest::addColumn<bool>("useLocaleCompare");
        QTest::addColumn<int>("stringSize");

        for (int i = 1; i < 10000; i += 2000) {
            QByteArray size = QByteArray::number(i);
            QTest::newRow(("locale aware compare--" + size).constData()) << true << i;
            QTest::newRow(("standard compare--" + size).constData()) << false << i;
        }
    }

    void TestBenchmark::series()
    {
        QFETCH(bool, useLocaleCompare);
        QFETCH(int, stringSize);

        QString str1 = QString().fill('A', stringSize);
        QString str2 = QString().fill('A', stringSize);
        int result;
        if (useLocaleCompare) {
            QBENCHMARK {
                result = str1.localeAwareCompare(str2);
            }
        } else {
            QBENCHMARK {
                result = (str1 == str2);
            }
        }
        Q_UNUSED(result);
    }

    QTEST_MAIN(TestBenchmark)
    #include "benchmarking.moc"