How to I make QMessageBox delete the content of a vector

Question

I'm very new to code so I apologise if this is a simple question but I am struggling. I have a GUI program that saves user input into a vector, displays it then can be saved as a txt file. Once it has been saved, I want a QMessageBox to appear asking if the user wishes to delete the now saved vector data. The vector is named v_History.

QMessageBox msgBox;
msgBox.setText("History saved to file.");
msgBox.setInformativeText("Would you like to delete the current history?");
msgBox.setStandardButtons(QMessageBox::Save | QMessageBox::Discard);
msgBox.setDefaultButton(QMessageBox::Discard);
msgBox.exec();    

Any help or advice is greatly appreciated. Thank you

Answer 1

When using setStandardButtons() , exec() returns a value indicating which standard button was clicked, eg:

QMessageBox msgBox;
msgBox.setText("History saved to file.");
msgBox.setInformativeText("Would you like to delete the current history?");
msgBox.setStandardButtons(QMessageBox::Save | QMessageBox::Discard);
msgBox.setDefaultButton(QMessageBox::Discard);
int ret = msgBox.exec();
if (ret == QMessageBox::Discard)
{
    // delete the history as needed ...
}