What I found out was ‘foreach’ loop takes more time than plain ‘for’ loop but for this also the time taken for traversing QList is far lesser than for QVector. I though that this might be because of some internal problem with Qt4.2 or with my system’s configuration. Thus, I re-wrote the code using STL List and Vector. I was surprised to see same result as I got for the QList and QVector.

Thus, I fially though of trying out my code in some other system but I got the same result. Still, I can’t understand the reason for this behavior.

You can get my code below :

example.h

#include <QtGui>
#include <QtCore>

#define MAX 900000

class Test
{
public:
QString name;
quint32 eid;
QString address;
Test(QString name, quint32 eid, QString address);
Test();
};

class Example
{
public:
Example();
};

class Example2
{
public:
Example2();
};

example.cpp

#include “example.h”

Example::Example()
{
QList<Test> list;
QVector<Test> vector(50000);
qDebug()<<”starting Example”;

QTime currTime = QTime::currentTime();
for(quint32 i = 0; i < 50000; ++i)
{
Test test(QString(“asasasasas”), i, QString(“aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa”));
list.append(test);
}
qDebug()<<”time taken for appending in list= “<< currTime.msecsTo(QTime::currentTime());

currTime = QTime::currentTime();
for(quint32 i = 0; i < 50000; ++i)
{
Test test(QString(“asasasasas”), i, QString(“aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa”));
vector.append(test);
}
qDebug()<<”time taken for appending in vector = “<< currTime.msecsTo(QTime::currentTime());
Test temp;
currTime = QTime::currentTime();
foreach(temp, list)
{
Test temp2 = temp;
}
qDebug()<<”foreach list = “<< currTime.msecsTo(QTime::currentTime());

QList<Test>::iterator it;
currTime = QTime::currentTime();
for(it = list.begin(); it != list.end(); ++it)
{
Test temp2 = *it;
}
qDebug()<<”for list = “<< currTime.msecsTo(QTime::currentTime());

quint32 size = list.size();
currTime = QTime::currentTime();
for(quint32 i = 0; i < size; ++i)
{
//Test temp2 = list.at(i);
Test temp2 = list[i];
}
qDebug()<<”for \”i\” list = “<< currTime.msecsTo(QTime::currentTime());

currTime = QTime::currentTime();
foreach(temp, vector)
{
Test temp2 = temp;
}
qDebug()<<”foreach vector = “<< currTime.msecsTo(QTime::currentTime());

QVector<Test>::iterator iter;
currTime = QTime::currentTime();
for(iter = vector.begin(); iter != vector.end(); ++iter)
{
Test temp2 = *iter;
}
qDebug()<<”for vector = “<< currTime.msecsTo(QTime::currentTime());

size = vector.size();
currTime = QTime::currentTime();
for(quint32 i = 0; i < size; ++i)
{
//Test temp2 = vector.at(i);
Test temp2 = vector[i];
}
qDebug()<<”for \”i\” vector = “<< currTime.msecsTo(QTime::currentTime());

}

example2.cpp

#include “example.h”
#include <vector.h>
#include <list.h>

Test::Test(QString name, quint32 eid, QString address)
{
this->name = name;
this->eid = eid;
this->address = address;
}

Test::Test()
{
}

Example2::Example2()
{
list<Test> testList;
vector<Test> testVector;
Test testArray[MAX];

QTime currTime = QTime::currentTime();
for(int i = 0; i < MAX; ++i)
{
Test temp(QString(“asasasasas”), i, QString(“aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa”));
testList.push_back(temp);
}
qDebug()<<”time taken for appending in list= “<< currTime.msecsTo(QTime::currentTime());

currTime = QTime::currentTime();
for(quint32 i = 0; i < MAX; ++i)
{
Test test(QString(“asasasasas”), i, QString(“aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa”));
testVector.push_back(test);
}
qDebug()<<”time taken for appending in vector = “<< currTime.msecsTo(QTime::currentTime());

currTime = QTime::currentTime();
for(quint32 i = 0; i < MAX; ++i)
{
Test test(QString(“asasasasas”), i, QString(“aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa”));
testArray[i] = test;
}
qDebug()<<”time taken for appending in Array = “<< currTime.msecsTo(QTime::currentTime());

currTime = QTime::currentTime();
list<Test>::iterator itList;
for(itList = testList.begin(); itList != testList.end(); ++itList)
{
Test temp2 = *itList;
}
qDebug()<<”for loop List = “<< currTime.msecsTo(QTime::currentTime());

currTime = QTime::currentTime();
vector<Test>::iterator itVector;
for(itVector = testVector.begin(); itVector != testVector.end(); ++itVector)
{
Test temp2 = *itVector;
}
qDebug()<<”for loop Vector = “<< currTime.msecsTo(QTime::currentTime());

currTime = QTime::currentTime();
for(int i = 0 ; i < MAX; ++i)
{
Test temp2 = testArray[i];
}
qDebug()<<”for loop Array = “<< currTime.msecsTo(QTime::currentTime());
}

main.cpp

#include <QApplication>
#include <example.h>

int main(int argc, char* argv[])
{
QApplication app(argc, argv);
Example ex1;

Example2 ex2;

return app.exec();
}

var infolink_pid = 46981;

At times I do use MS Windows in my laptop, specially when I am in a mood to play some games, but most of the time I prefer using Ubuntu or Fedora.

Yesterday, I came across the news that MS has made it Office suit online. I though of trying it out once. If not use it, at least compare it with Google Docs, which I use at times.

After I took the pain to create an account this is what I get :

MS Does not want Linux user to use its Online Office Suit

Why should an browser application be dependent on some OS?

Now that I have experienced this, I would be reluctant to try out again. Thus, MS ends up loosing customers. I think this was a great thing that MS had come out with but these things ruins all the fun.

var infolink_pid = 46981;

http://content.zdnet.com/2346-9595_22-263589-1.html

Second problem is there is no right click in Mac