Macro std::cmp::lex_compare

macro lex_compare($lhs, $rhs) { ... }

source

Helper macro for implementing a lexicographic order.

The macro will short-circuit the enclosuing function if lhs and rhs are not equal and continue if they are.

Example

use std::cmp::{Ordering, Comparable, lex_compare};

struct IPv4 {
    a: u8,
    b: u8,
    c: u8,
    d: u8,
}

impl IPv4 {
    fn compare(lhs: &IPv4, rhs: &IPv4) -> Ordering {
        lex_compare!(lhs.a, rhs.a);
        lex_compare!(lhs.b, rhs.b);
        lex_compare!(lhs.c, rhs.c);
        lex_compare!(lhs.d, rhs.d);
        Ordering::Equal
    }

    mixin Comparable<IPv4>;
}
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