Method visit_pre

src/expr/src/relation.rs:2332–2338

Iterative pre-order visitor.

(&'a self, mut f: F)

    /// Iterative pre-order visitor.
    pub fn visit_pre<'a, F: FnMut(&'a Self)>(&'a self, mut f: F) {
        let mut worklist = vec![self];
        while let Some(expr) = worklist.pop() {
            f(expr);
            worklist.extend(expr.children().rev());
        }
    }

    /// Iterative pre-order visitor.
    pub fn visit_pre_mut<F: FnMut(&mut Self)>(&mut self, mut f: F) {