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guide: note __hash__ can have any integer type up to 64 bits

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David Hewitt 2022-08-21 16:33:07 +01:00
parent c5ecf47890
commit 86a11164e0
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guide/src/class/protocols.md
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@ -44,7 +44,7 @@ given signatures should be interpreted as follows:
- `__hash__(<self>) -> isize`
Objects that compare equal must have the same hash value.
Objects that compare equal must have the same hash value. Any type up to 64 bits may be returned instead of `isize`, PyO3 will convert to an isize automatically (wrapping unsigned types like `u64` and `usize`).
<details>
<summary>Disabling Python's default hash</summary>
By default, all `#[pyclass]` types have a default hash implementation from Python. Types which should not be hashable can override this by setting `__hash__` to `None`. This is the same mechanism as for a pure-Python class. This is done like so: