pub fn handler(&mut self) -> Option<&mut E> {
        match &self.handler {
            Some(_) => self.handler.as_mut(),
            None => None,
        }
    }
/// Gets a mutable referance to handler if it's defined
Gets a mutable referance to handler if it's defined
Gets a mutable referance to handler if it ' s defined
pub fn handler(&mut self) -> Option<&mut E> {
        match &self.handler {
            Some(_) => self.handler.as_mut(),
            None => None,
        }
    }
pub fn handler ( & mut self ) -> Option < & mut E > { match & self . handler { Some ( _ ) => self . handler . as_mut ( ) , None => None , } }
Gets a mutable referance to handler if it's defined
Gets a mutable referance to handler if it ' s defined
&mut self
&mut self