10000 Feature request: inter field invariants · Issue #304 · tobgu/pyrsistent · GitHub
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Feature request: inter field invariants #304

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travis-leith opened this issue May 9, 2025 · 1 comment
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Feature request: inter field invariants #304

travis-leith opened this issue May 9, 2025 · 1 comment

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@travis-leith
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For example, imagine I have a class that represents some bounds on something, and it has a lower bound and an upper bound. If I want to make sure lower bound is less than upper bound, I must use a tuple field.
It might be convenient in this case, and in others, to be able to specify an invariant for the class itself, and that invariant can access multiple fields.
@travis-leith
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never mind, I see that this is indeed a thing already

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