Qt5 Tutorial QList - 2020
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QList
In this tutorial, we will learn about QList.
The QList class is a template class that provides lists.
QList<T> is one of Qt's generic container classes. It stores a list of values and provides fast index-based access as well as fast insertions and removals.
Although it is implemented as an array-list, it provides very fast prepends and appends. For most applications, QList is the best type to use.
| Index lookup | Insertion | Prepending | Appending | |
|---|---|---|---|---|
| QLinkedList<T> | O(n) | O(1) | O(1) | O(1) |
| QList<T> | O(1) | O(n) | Amort. O(1) | Amort. O(1) |
| QVector<T> | O(1) | O(n) | O(n) | Amort. O(1) |
#include <QCoreApplication>
#include <QList>
#include <QDebug>
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
QList<int> List;
for(int i = 0; i < 6; i++) List.append(i);
List.removeOne(4);
foreach(int n, List) qDebug() << n;
return a.exec();
}
Output:
0 1 2 3 5
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