Method start_ptr

regex/src/dfa.rs:1593–1599

Sets the STATE_START bit in the given state pointer if and only if we have a prefix to scan for. If there's no prefix, then it's a waste to treat the start state specially.

(&self, si: StatePtr)

    /// If there's no prefix, then it's a waste to treat the start state
    /// specially.
    fn start_ptr(&self, si: StatePtr) -> StatePtr {
        if self.has_prefix() {
            si | STATE_START
        } else {
            si
        }
    }

    /// Approximate size returns the approximate heap space currently used by
    /// the DFA. It is used to determine whether the DFA's state cache needs to