#include <QtGui>
class QApplication;
class QDialog;
int main(int argc, char **argv)
{
QApplication app(argc, argv);
QDialog *one = new QDialog(0);
QDialog *two = new QDialog(one);
one->show();
return app.exec();
}
//main.cpp:12: warning: unused variable `QDialog*two'
为什么有这样的警告?