Qt Scxml calculator-widgets example question

[d_h_mcinnes]

Hi All

I have a question about the Qt Scxml calculator-widgets example. When I edit the 'main' function like this:

int main(int argc, char **argv)
{
QApplication app(argc, argv);

CalculatorStateMachine machine;
MainWindow mainWindow(&machine);

machine.connectToState("begin", [](bool active) {
    cout << (active ? "entered" : "exited") << "begin state";
});

machine.connectToState("operand1", [](bool active) {
    cout << (active ? "entered" : "exited") << "operand1 state";
});

machine.connectToState("int1", [](bool active) {
    cout << (active ? "entered" : "exited") << "int1 state";
});

machine.connectToState("negated1", [](bool active) {
    cout << (active ? "entered" : "exited") << "negated1 state";
});


machine.start();

mainWindow.show();
return app.exec();

}

... and run from the command line, none of the couts appear on the terminal until I close the calculator terminal, then they all get dumped at once. Why is this? Are the couts actually getting executed when the events occur, but are buffered somehow? I expected the couts to be printed as the events occurred.

[mrjj]

Hi
The cout is buffered, so you have to emit endlines to get it to flush or call flush.
cout << (active ? "entered" : "exited") << "operand1 state" << std::endl;

[d_h_mcinnes]

Thank you very much. I hope I can return the favor one day.