Why I get the ”left of must have class/struct/union” error?

Question

Asked: August 8, 20222022-08-08T03:32:56+00:00 2022-08-08T03:32:56+00:00In: Error

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I encounter the error ”left of must have class/struct/union” when I run the following line:

void MainWindow::on_addEmployee_clicked()
{
    DatabaseControl myDBControl();
    myDBControl.addEmployee();
}

Can someone help me to solve it? Thanks!

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hdtutoria · Accepted Answer · 2022-08-08T03:42:26+00:00

The cause: I think the error is here:

DatabaseControl myDBControl();

You created the myDBControl function, which accepts no arguments and outputs a DatabaseControl.

Solution: Don’t use the () when declarating object without any constructor arguments:

DatabaseControl myDBControl;