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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 268 insertions, 0 deletions

diff --git a/examples/qtestlib/tutorial5/containers.cpp b/examples/qtestlib/tutorial5/containers.cpp
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+++ b/examples/qtestlib/tutorial5/containers.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the test suite 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."
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+// This file contains benchmarks for comparing QVector against std::vector
+
+#include <QtCore>
+#include <QVector>
+#include <vector>
+
+#include <qtest.h>
+
+template <typename T> // T is the item type
+class UseCases {
+public:
+    virtual ~UseCases() {}
+
+    // Use case: Insert \a size items into the vector.
+    virtual void insert(int size) = 0;
+
+    // Use case: Lookup \a size items from the vector.
+    virtual void lookup(int size) = 0;
+};
+
+template <typename T>
+T * f(T *ts) // dummy function to prevent code from being optimized away by the compiler
+{
+    return ts;
+}
+
+// This subclass implements the use cases using QVector as efficiently as possible.
+template <typename T>
+class UseCases_QVector : public UseCases<T>
+{
+    void insert(int size)
+    {
+        QVector<T> v;
+        T t;
+        QBENCHMARK {
+            for (int i = 0; i < size; ++i)
+                v.append(t);
+        }
+    }
+
+    void lookup(int size)
+    {
+        QVector<T> v;
+
+        T t;
+        for (int i = 0; i < size; ++i)
+            v.append(t);
+
+        T *ts = new T[size];
+        QBENCHMARK {
+            for (int i = 0; i < size; ++i)
+                ts[i] = v.value(i);
+        }
+        f<T>(ts);
+        delete[] ts;
+    }
+};
+
+// This subclass implements the use cases using std::vector as efficiently as possible.
+template <typename T>
+class UseCases_stdvector : public UseCases<T>
+{
+    void insert(int size)
+    {
+        std::vector<T> v;
+        T t;
+        QBENCHMARK {
+            for (int i = 0; i < size; ++i)
+                v.push_back(t);
+        }
+    }
+
+    void lookup(int size)
+    {
+        std::vector<T> v;
+
+        T t;
+        for (int i = 0; i < size; ++i)
+            v.push_back(t);
+
+        T *ts = new T[size];
+        QBENCHMARK {
+            for (int i = 0; i < size; ++i)
+                ts[i] = v[i];
+        }
+        f<T>(ts);
+        delete[] ts;
+    }
+};
+
+struct Large { // A "large" item type
+    int x[1000];
+};
+
+// Symbian devices typically have limited memory
+#ifdef Q_OS_SYMBIAN
+#  define LARGE_MAX_SIZE 2000
+#else
+#  define LARGE_MAX_SIZE 20000
+#endif
+
+class tst_vector_vs_std : public QObject
+{
+    Q_OBJECT
+public:
+    tst_vector_vs_std()
+    {
+        useCases_QVector_int = new UseCases_QVector<int>;
+        useCases_stdvector_int = new UseCases_stdvector<int>;
+
+        useCases_QVector_Large = new UseCases_QVector<Large>;
+        useCases_stdvector_Large = new UseCases_stdvector<Large>;
+    }
+
+private:
+    UseCases<int> *useCases_QVector_int;
+    UseCases<int> *useCases_stdvector_int;
+    UseCases<Large> *useCases_QVector_Large;
+    UseCases<Large> *useCases_stdvector_Large;
+
+private slots:
+    void insert_int_data();
+    void insert_int();
+    void insert_Large_data();
+    void insert_Large();
+    void lookup_int_data();
+    void lookup_int();
+    void lookup_Large_data();
+    void lookup_Large();
+};
+
+void tst_vector_vs_std::insert_int_data()
+{
+    QTest::addColumn<bool>("useStd");
+    QTest::addColumn<int>("size");
+
+    for (int size = 10; size < 20000; size += 100) {
+        const QByteArray sizeString = QByteArray::number(size);
+        QTest::newRow(("std::vector-int--" + sizeString).constData()) << true << size;
+        QTest::newRow(("QVector-int--" + sizeString).constData()) << false << size;
+    }
+}
+
+void tst_vector_vs_std::insert_int()
+{
+    QFETCH(bool, useStd);
+    QFETCH(int, size);
+
+    if (useStd)
+        useCases_stdvector_int->insert(size);
+    else
+        useCases_QVector_int->insert(size);
+}
+
+void tst_vector_vs_std::insert_Large_data()
+{
+    QTest::addColumn<bool>("useStd");
+    QTest::addColumn<int>("size");
+
+    for (int size = 10; size < LARGE_MAX_SIZE; size += 100) {
+        const QByteArray sizeString = QByteArray::number(size);
+        QTest::newRow(("std::vector-Large--" + sizeString).constData()) << true << size;
+        QTest::newRow(("QVector-Large--" + sizeString).constData()) << false << size;
+    }
+}
+
+void tst_vector_vs_std::insert_Large()
+{
+    QFETCH(bool, useStd);
+    QFETCH(int, size);
+
+    if (useStd)
+        useCases_stdvector_Large->insert(size);
+    else
+        useCases_QVector_Large->insert(size);
+}
+
+//! [1]
+void tst_vector_vs_std::lookup_int_data()
+{
+    QTest::addColumn<bool>("useStd");
+    QTest::addColumn<int>("size");
+
+    for (int size = 10; size < 20000; size += 100) {
+        const QByteArray sizeString = QByteArray::number(size);
+        QTest::newRow(("std::vector-int--" + sizeString).constData()) << true << size;
+        QTest::newRow(("QVector-int--" + sizeString).constData()) << false << size;
+    }
+}
+//! [1]
+
+//! [2]
+void tst_vector_vs_std::lookup_int()
+{
+    QFETCH(bool, useStd);
+    QFETCH(int, size);
+
+    if (useStd)
+        useCases_stdvector_int->lookup(size); // Create a std::vector and run the benchmark.
+    else
+        useCases_QVector_int->lookup(size); // Create a QVector and run the benchmark.
+}
+//! [2]
+
+void tst_vector_vs_std::lookup_Large_data()
+{
+    QTest::addColumn<bool>("useStd");
+    QTest::addColumn<int>("size");
+
+    for (int size = 10; size < LARGE_MAX_SIZE; size += 100) {
+        const QByteArray sizeString = QByteArray::number(size);
+        QTest::newRow(("std::vector-Large--" + sizeString).constData()) << true << size;
+        QTest::newRow(("QVector-Large--" + sizeString).constData()) << false << size;
+    }
+}
+
+void tst_vector_vs_std::lookup_Large()
+{
+    QFETCH(bool, useStd);
+    QFETCH(int, size);
+
+    if (useStd)
+        useCases_stdvector_Large->lookup(size);
+    else
+        useCases_QVector_Large->lookup(size);
+}
+
+QTEST_MAIN(tst_vector_vs_std)
+#include "main.moc"