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// 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>

static 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];

};

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 < 20000; 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);

}

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;

    }

}

void tst_vector_vs_std::lookup_int()

{

    QFETCH(bool, useStd);

    QFETCH(int, size);

    if (useStd)

        useCases_stdvector_int->lookup(size);

    else

        useCases_QVector_int->lookup(size);

}

void tst_vector_vs_std::lookup_Large_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-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"