Implement serialize/deserialize for std::iter::Rev?

[GHPR]

The std::tier::Rev struct currently does not implement the serialize and deserialize traits. Would it be possible to fix that?

[flippette]

If you're talking about the serde traits, that has to be fixed by serde, not std.

[kornel]

It doesn't make sense to serialize or deserialize any iterator in Rust.

Unlike C++, Rust's iterators don't describe a collection. They only represent a temporary state of a single-use-only stream of items. They're the i in for(int i=0; i < 10; i++) collection[i].

You should be (de)serializing the collection instead of state of iteration of a collection.

[kpreid]

@kornel

It doesn't make sense to serialize or deserialize any iterator in Rust.

It could. Serializing a non-borrowing iterator, as part of serializing the state of a long-running computation that might be interrupted, is a coherent thing to do, though certainly a narrow situation.

[quinedot]

Rev<Range<{integer}>> is one I thought of that makes sense (also a niche desire).