cuowu

标签：cuowu int ceshi idiao123 error home MainWindow

/home/idiao123/ceshi/mainwindow.h:17: error: 'nullptr' was not declared in this scope
     explicit MainWindow(QWidget *parent = nullptr);
                                           ^
/home/idiao123/ceshi/main.cpp:-1: In function 'int main(int, char**)':

/home/idiao123/ceshi/main.cpp:7: error: call to 'MainWindow::MainWindow(QWidget*)' uses the default argument for parameter 1, which is not yet defined
     MainWindow w;
                ^

 

/home/idiao123/ceshi/mainwindow.cpp:45: error: no matching function for call to 'QTimer::singleShot(int&, MainWindow* const, MainWindow::playBuzzer(int, int)::<lambda()>)'

 

/home/idiao123/ceshi/mainwindow.cpp:45: error: no matching function for call to 'QTimer::singleShot(int&, MainWindow*, void (*)())'
     QTimer::singleShot(duration, this, &MainWindow::stopBuzzer);
                                                               ^

 

标签：cuowu,int,ceshi,idiao123,error,home,MainWindow
From： https://www.cnblogs.com/yangjialong/p/18297375