pub fn num_pages(&self) -> usize {
        match self.mapping {
            Some(ref mapping) => mapping.num_pages(),
            None => 0,
        }
    }
/// Returns the max number of (possibly) non-zero pages in this
/// checkpoint.
Returns the max number of (possibly) non-zero pages in this
checkpoint.
Returns the max number of ( possibly ) non - zero pages in this checkpoint .
pub fn num_pages(&self) -> usize {
        match self.mapping {
            Some(ref mapping) => mapping.num_pages(),
            None => 0,
        }
    }
pub fn num_pages ( & self ) -> usize { match self . mapping { Some ( ref mapping ) => mapping . num_pages ( ) , None => 0 , } }
Returns the max number of (possibly) non-zero pages in this
checkpoint.
Returns the max number of ( possibly ) non - zero pages in this checkpoint .
&self
&self