Module visit_diff::constant

A do-nothing differ that always winds up returning a fixed value.

This module is mostly useful during development of a new Differ: there are a lot of associated types and functions required to implement Differ, but it's nice to see your code compiling part way through. You can stub out parts of Differ by deferring to Const. For example, if your Differ returns a u32 and you haven't implemented map diffing yet, you can use the associated type

type MapDiffer = visit_diff::constant::Const<u32>;

and then stub out begin_map like so:

fn begin_map(self) -> Self::MapDiffer {
    visit_diff::constant::Const(4)
}

Structs

Const