What is the right way to initialize a QList?

c++ qt qlist
msgmaxim picture msgmaxim · Sep 25, 2013 · Viewed 44.6k times · Source

What is the right way to initialize QList? I want to make this code shorter:

QSplitter splitter;
QList<int> list;
list.append(1);
list.append(1);
splitter.setSizes(list);

But when I use initialization from std::list, it doesn't seem be working:

splitter.setSizes(QList<int>::fromStdList(std::list<int>(1, 1)));

In latter case, the splitter seems to divide in ratio 1:0.

Answer

lpapp picture lpapp · Sep 25, 2013

You could use the following code:

QList<int> list = QList<int>() << 1 << 1;

or initializer list with C++11:

QList<int> list({1, 1});

You can enable the latter with the -std=c++0x or -std=c++11 option for gcc. You will also need the relevant Qt version for that where initializer list support has been added to the QList constructor.

Related questions

Qt: is removing QList elements while iterating using foreach macro possible?

I'm new to Qt and trying to learn the idioms. The foreach documentation says: Qt automatically takes a copy of the container when it enters a foreach loop. If you modify the container as you are iterating, that won't affect …

Read More
How to get the min and the max of a QList in Qt without using any iterator?

Is there a way to get the min and the max of a QList in Qt without using any iterator ? Here is the code using iterator : QList<double>::iterator min = std::min_element(listVal.begin(), listVal.end()); QList&…

Read More
How to iterate through a QStringList

I'm trying to iterate through two different directories. The two directories are on the same root /. void MainWindow::loadPlugins() { pluginsDir = QDir(qApp -> applicationDirPath()); #if defined(Q_OS_WIN) if (pluginsDir.dirName().toLower() == "debug" || pluginsDir.dirName().toLower() == "release") pluginsDir.…

Read More