WXUNUSED的作用

 

WXUNUSED is a macro you'll use for the wxEvent parameter of a hollow event handler to make some compilers not to complain about unused parameters. This simple concept used to appear sometimes a problem for beginners because it seems to have been never explained anywhere openly before.

Usage example

void MyFrame::OnExit( wxEvent& WXUNUSED(event) )
{
// Do Something
}

another article qutoed as the following:

  

   
In many examples I have noted that the event methods are declared like:
void OnEvent(wxCommandEvent& WXUNUSED(event));

What does WXUNUSED do?

  
As I understand it, it's a way to prevent the compiler from issuing
"unused parameter" warnings when you write a function that's called
from the EVENT_TABLE, but don't use the event parameter..

[ciach]

  

   
void frm::btnquit_click(wxCommandEvent & WXUNUSED(event)){
        Destroy();
}

And the compiler won't complain :)

  
The compiler won't complain if you do:

void frm::btnquit_click(wxCommandEvent & ) {
....
};

(at least gcc won't complain)