An iterator for the elements in a single chunk.
ChunkIndex acts like the grouping key function for IntoChunks
An iterator that yields the Chunk iterators.
An iterator for the elements in a single group.
GroupBy is the storage for the lazy grouping operation.
An iterator that yields the Group iterators.
ChunkLazy is the storage for a lazy chunking operation.
A trait to unify FnMut for GroupBy with the chunk key in IntoChunks