author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Mon, 03 May 2010 13:17:34 +0300 | |
changeset 19 | fcece45ef507 |
parent 18 | 2f34d5167611 |
permissions | -rw-r--r-- |
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/**************************************************************************** |
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** |
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). |
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** All rights reserved. |
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** Contact: Nokia Corporation (qt-info@nokia.com) |
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** |
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** This file is part of the test suite of the Qt Toolkit. |
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** |
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** $QT_BEGIN_LICENSE:LGPL$ |
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** No Commercial Usage |
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** This file contains pre-release code and may not be distributed. |
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** You may use this file in accordance with the terms and conditions |
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** contained in the Technology Preview License Agreement accompanying |
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** this package. |
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** |
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** GNU Lesser General Public License Usage |
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** Alternatively, this file may be used under the terms of the GNU Lesser |
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** General Public License version 2.1 as published by the Free Software |
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** Foundation and appearing in the file LICENSE.LGPL included in the |
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** packaging of this file. Please review the following information to |
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** ensure the GNU Lesser General Public License version 2.1 requirements |
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
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** |
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** In addition, as a special exception, Nokia gives you certain additional |
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** rights. These rights are described in the Nokia Qt LGPL Exception |
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
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** |
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** If you have questions regarding the use of this file, please contact |
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** Nokia at qt-info@nokia.com. |
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** |
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** |
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** |
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** |
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** |
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** |
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** |
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** |
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** $QT_END_LICENSE$ |
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** |
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****************************************************************************/ |
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// This file contains benchmarks for comparing QVector against std::vector |
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|
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#include <QtCore> |
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#include <QVector> |
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#include <vector> |
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#include <qtest.h> |
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template <typename T> // T is the item type |
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class UseCases { |
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public: |
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virtual ~UseCases() {} |
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// Use case: Insert \a size items into the vector. |
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virtual void insert(int size) = 0; |
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// Use case: Lookup \a size items from the vector. |
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virtual void lookup(int size) = 0; |
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}; |
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template <typename T> |
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T * f(T *ts) // dummy function to prevent code from being optimized away by the compiler |
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{ |
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return ts; |
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} |
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// This subclass implements the use cases using QVector as efficiently as possible. |
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template <typename T> |
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class UseCases_QVector : public UseCases<T> |
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{ |
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void insert(int size) |
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{ |
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QVector<T> v; |
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T t; |
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QBENCHMARK { |
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for (int i = 0; i < size; ++i) |
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v.append(t); |
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} |
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} |
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|
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void lookup(int size) |
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{ |
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QVector<T> v; |
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T t; |
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for (int i = 0; i < size; ++i) |
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v.append(t); |
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T *ts = new T[size]; |
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QBENCHMARK { |
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for (int i = 0; i < size; ++i) |
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ts[i] = v.value(i); |
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} |
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f<T>(ts); |
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delete[] ts; |
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} |
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}; |
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// This subclass implements the use cases using std::vector as efficiently as possible. |
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template <typename T> |
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class UseCases_stdvector : public UseCases<T> |
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{ |
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void insert(int size) |
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{ |
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std::vector<T> v; |
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T t; |
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QBENCHMARK { |
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for (int i = 0; i < size; ++i) |
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v.push_back(t); |
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} |
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} |
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112 |
|
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void lookup(int size) |
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{ |
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std::vector<T> v; |
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T t; |
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for (int i = 0; i < size; ++i) |
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v.push_back(t); |
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|
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T *ts = new T[size]; |
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QBENCHMARK { |
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for (int i = 0; i < size; ++i) |
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ts[i] = v[i]; |
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} |
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f<T>(ts); |
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delete[] ts; |
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} |
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}; |
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struct Large { // A "large" item type |
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int x[1000]; |
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}; |
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134 |
|
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// Symbian devices typically have limited memory |
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#if defined(Q_OS_SYMBIAN) || defined(Q_WS_WINCE) |
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# define LARGE_MAX_SIZE 2000 |
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#else |
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# define LARGE_MAX_SIZE 20000 |
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#endif |
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141 |
|
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class tst_vector_vs_std : public QObject |
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{ |
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Q_OBJECT |
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public: |
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tst_vector_vs_std() |
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{ |
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useCases_QVector_int = new UseCases_QVector<int>; |
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useCases_stdvector_int = new UseCases_stdvector<int>; |
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|
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useCases_QVector_Large = new UseCases_QVector<Large>; |
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useCases_stdvector_Large = new UseCases_stdvector<Large>; |
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} |
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|
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private: |
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UseCases<int> *useCases_QVector_int; |
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UseCases<int> *useCases_stdvector_int; |
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UseCases<Large> *useCases_QVector_Large; |
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UseCases<Large> *useCases_stdvector_Large; |
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|
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private slots: |
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void insert_int_data(); |
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void insert_int(); |
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void insert_Large_data(); |
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void insert_Large(); |
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void lookup_int_data(); |
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void lookup_int(); |
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void lookup_Large_data(); |
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void lookup_Large(); |
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}; |
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|
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void tst_vector_vs_std::insert_int_data() |
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{ |
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QTest::addColumn<bool>("useStd"); |
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QTest::addColumn<int>("size"); |
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|
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for (int size = 10; size < 20000; size += 100) { |
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const QByteArray sizeString = QByteArray::number(size); |
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QTest::newRow(("std::vector-int--" + sizeString).constData()) << true << size; |
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QTest::newRow(("QVector-int--" + sizeString).constData()) << false << size; |
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} |
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} |
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|
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void tst_vector_vs_std::insert_int() |
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{ |
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QFETCH(bool, useStd); |
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QFETCH(int, size); |
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|
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if (useStd) |
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useCases_stdvector_int->insert(size); |
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else |
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useCases_QVector_int->insert(size); |
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} |
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|
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void tst_vector_vs_std::insert_Large_data() |
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{ |
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QTest::addColumn<bool>("useStd"); |
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QTest::addColumn<int>("size"); |
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|
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for (int size = 10; size < LARGE_MAX_SIZE; size += 100) { |
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const QByteArray sizeString = QByteArray::number(size); |
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QTest::newRow(("std::vector-Large--" + sizeString).constData()) << true << size; |
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QTest::newRow(("QVector-Large--" + sizeString).constData()) << false << size; |
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} |
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} |
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|
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void tst_vector_vs_std::insert_Large() |
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{ |
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QFETCH(bool, useStd); |
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QFETCH(int, size); |
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|
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if (useStd) |
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useCases_stdvector_Large->insert(size); |
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else |
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useCases_QVector_Large->insert(size); |
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} |
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void tst_vector_vs_std::lookup_int_data() |
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{ |
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QTest::addColumn<bool>("useStd"); |
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QTest::addColumn<int>("size"); |
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for (int size = 10; size < 20000; size += 100) { |
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const QByteArray sizeString = QByteArray::number(size); |
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QTest::newRow(("std::vector-int--" + sizeString).constData()) << true << size; |
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QTest::newRow(("QVector-int--" + sizeString).constData()) << false << size; |
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} |
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} |
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void tst_vector_vs_std::lookup_int() |
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{ |
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QFETCH(bool, useStd); |
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QFETCH(int, size); |
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if (useStd) |
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useCases_stdvector_int->lookup(size); |
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else |
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useCases_QVector_int->lookup(size); |
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} |
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void tst_vector_vs_std::lookup_Large_data() |
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{ |
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QTest::addColumn<bool>("useStd"); |
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QTest::addColumn<int>("size"); |
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for (int size = 10; size < LARGE_MAX_SIZE; size += 100) { |
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const QByteArray sizeString = QByteArray::number(size); |
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QTest::newRow(("std::vector-Large--" + sizeString).constData()) << true << size; |
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QTest::newRow(("QVector-Large--" + sizeString).constData()) << false << size; |
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} |
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} |
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void tst_vector_vs_std::lookup_Large() |
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{ |
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QFETCH(bool, useStd); |
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QFETCH(int, size); |
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if (useStd) |
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useCases_stdvector_Large->lookup(size); |
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useCases_QVector_Large->lookup(size); |
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} |
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QTEST_MAIN(tst_vector_vs_std) |
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#include "main.moc" |