We have:
pub struct Animal {
Dog,
Cat(Cat),
Horse(usize, String)
}
We want to auto generate:
impl Animal {
pub fn as_dog(&self) -> Option<()>,
pub fn as_cat(&self) -> Option<&Cat>,
pub fn as_horse(&self) -> Option<(&usize, &String)>,
}
Is there an existing crate that provides this as a derive macro ?
I can't be sure, but I've wanted something like this¹ before and never found it.
And I never wrote it myself because cost/benefit didn't lean that way at the time.
¹ technically, this and enum variant predicates eg is_dog() etc.
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