Option<V<T>>.iter() when V<T> has .iter()

1

Let V be some collection class, say, HashMap, HashSet, Vec, ...

Consider:

coll: Option<V<T>>;

Is there a simple way to do a "coll.iter" where

Some(lst) => iter over lst.iter()
None => some iter that is empty
2

coll.iter().flatten()

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3

coll.iter().flatten()

1 Like
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