IntoLendingIterator implementation

I am not good at English. Sorry if there are any funny expressions.

I am currently thinking about the LendingIterator, which is often introduced as an example of GAT. It is similar in usage to a normal iterator, except that the item's lifetime is tied to the iterator.

Therefore, I thought the APIs around the LendingIterator should be similar to those of the normal iterators.

However, when I thought about IntoLendingIterator, that corresponds to IntoIterator for Iterator, I realized that it could not be similar. IntoIterator has two associated types Item and IntoIter. If I try to have corresponding two associated types in IntoLendingIterator, I can't describe the lifetime relationship between them well.

Thus, I searched crates.io to see how others implemented such features in LendingIterator. Then I found that most of crates support such features in process of converting from Iterator to LendingIterator. However, I could not find any crate that took the approach I had in mind (ex: gat-lending-iterator, lending-iterator, lender).

Where did I go wrong...?

  • In the first place, my approach is not good?
  • My approach is good, but it can't?
  • My approach can be achieved in some way?

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