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This post is auto-generated from RSS feed The Rust Programming Language Forum - Latest topics. Source: `IntoIter` type when the `into_iter` is a bunch of `values`, `map`, `flatten` etc. calls?

I'm trying to implement IntoIterator for my type and I'm not sure how to specify the associated type IntoIter.

The into_iter function body looks like this:

self.set.values().map(TraitPreds::iter).flatten()

So the concrete iterator type is a complex type and I don't want to figure it out myself. Normally in a non-trait method I'd use impl Iterator<Item = ...> + '_, but that's not valid when specifying associated types.

I'd normally not care and just implement non-trait into_iter/iters and use them explicitly in the loops, but I have code that iterates the previous version of this type currently and I'm trying to be somewhat backwards compatible to keep the diff small.

Is there a trick to this? Do I have to manually figure out the concrete iterator type here?

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