Method num_byte_classes

regex/src/dfa.rs:1548–1551

Returns the number of byte classes required to discriminate transitions in each state. invariant: num_byte_classes() == len(State.next)

(&self)

    ///
    /// invariant: num_byte_classes() == len(State.next)
    fn num_byte_classes(&self) -> usize {
        // We add 1 to account for the special EOF byte.
        (self.prog.byte_classes[255] as usize + 1) + 1
    }

    /// Given an input byte or the special EOF sentinel, return its
    /// corresponding byte class.