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Update rfcs/generalized-iteration.md

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Co-authored-by: dcope-rbx <91100513+dcope-rbx@users.noreply.github.com>
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Arseny Kapoulkine 2022-02-02 10:05:08 -08:00 • committed by GitHub
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@ -46,7 +46,7 @@ end
### __iter ### __iter
To support self-iterating objects, we modify the iteration protocol as follows: instead of simply expanding the result of expression `iter` into three variables (`gen`, `state` and `index`), we check if the first result has an `__iter` metamethod (which can be the case if it's a table, userdata or another composit object (e.g. a record in the future). If it does, the metamethod is called with `gen` as the first argument, and the returned three values replace `gen`/`state`/`index`. This happens *before* the loop: To support self-iterating objects, we modify the iteration protocol as follows: instead of simply expanding the result of expression `iter` into three variables (`gen`, `state` and `index`), we check if the first result has an `__iter` metamethod (which can be the case if it's a table, userdata or another composite object (e.g. a record in the future). If it does, the metamethod is called with `gen` as the first argument, and the returned three values replace `gen`/`state`/`index`. This happens *before* the loop:
```lua ```lua
if getmetatable(gen) and getmetatable(gen).__iter then if getmetatable(gen) and getmetatable(gen).__iter then