Question

Possible Duplicate:
Error calling template method in “templated-base-class”

The following code compiles with MSVC10 but not with gcc 4.2.1:

template<class BaseQNativeWindow>
class NativeWindow : public BaseQNativeWindow
{
public:
  NativeWindow(AIPanelPlatformWindow handle) : BaseQNativeWindow(handle)
  {}

protected:
  virtual void closeEvent(QCloseEvent *e)
  {
    QList<QWidget *> childrenList;
    childrenList = BaseQNativeWindow::findChildren< QWidget * >(); // GCC ERROR
    foreach(QWidget *child, childrenList)
    {
      child->close();
    }
  }
};

This is what gcc complains about:

error: expected primary-expression before ‘*’ token  
error: expected primary-expression before ‘>’ token  
error: expected primary-expression before ‘)’ token  

findChildren is a templated method that BaseQNativeWindow must provide. It seems that gcc assumes that findChildren is not a template even before knowing what type BaseQNativeWiindow is. Can anyone explain this?

Thanks.

Answer 1

You have to say:

BaseQNativeWindow::template findChildren< QWidget * >()
//                 ^^^^^^^^

Since findChildren is a dependent name, its meaning must be disambiguated.