Impl Debug for multi-variant enum

help
1 
pub enum FnCast {
    FnReturnContext(fn(Context) -> Context),
    FnReturnJSON(fn(Context) -> Value),
    FnContext(fn(Context)),
    FnOther(fn(Other)),
    FnPush(for<'a> fn(SomeType, &mut Another)),
}

the standard derive macro works for all but FnPush. How do I implement debug here?

2

You can implement Debug for a wrapper type around fn(SomeType, &mut Another), like this:

pub struct DebugFn(pub fn(SomeType, &mut Another));

impl fmt::Debug for DebugFn {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "{:p}", &self.0)
    }
}
1 Like
3

I dont like the indirection... but it works. TY :slight_smile:

4

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