Enum NextStatus 

pub enum NextStatus {
    Item(usize),
    End,
    TooSmall(usize),
    SerErr,
}

Outcome of StreamState::next_into — mapped to FFI status codes by the macro-generated next shim.

Variants

Item(usize)

An item was written; payload is buf[..n].

End

No more items.

TooSmall(usize)

The buffer was too small; usize is the size required. The item is retained for the next call (no item lost on grow-and-retry).

SerErr

Serializing the item failed.