fn extend<I: Iterator<Item = (K, V, R)>>(&mut self, iter: I) {
        for item in iter {
            self.push(item);
        }
    }
/// Adds an ordered sequence of elements to the batch.
Adds an ordered sequence of elements to the batch.
Adds an ordered sequence of elements to the batch .
fn extend<I: Iterator<Item = (K, V, R)>>(&mut self, iter: I) {
        for item in iter {
            self.push(item);
        }
    }
fn extend < I : Iterator < Item = ( K , V , R ) > > ( & mut self , iter : I ) { for item in iter { self . push ( item ) ; } }
Adds an ordered sequence of elements to the batch.
Adds an ordered sequence of elements to the batch .
&mut self
iter
I