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Matt Godbolt sold me on Rust by showing me C++

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611 points LorenDB | 1 comments | 06 May 25 17:51 UTC | HN request time: 0s | source
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xarope ◴[07 May 25 03:21 UTC] No.43911947[source]▶
This reminds me of SQL's constraints, or pydantic's custom types and validators, which can validate that a value should be an int, and between 0-999, and not exceed, e.g. -1 or 1000.

pydantic is a library for python, but I'm not aware of anything similar in rust or golang that can do this yet? (i.e. not just schema validation, but value range validation too)

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kstrauser ◴[07 May 25 18:00 UTC] No.43918793[source]▶
The semantics are a little different in that you have to explicitly call .validate(), but Rust's "validator" crate[0] feels a lot like Pydantic to me.

[0]https://docs.rs/validator/latest/validator/

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1. xarope ◴[09 May 25 03:51 UTC] No.43933655[source]▶
I'm aware of this as well as go(lang)'s https://github.com/go-playground/validator, so you are right, I'm wondering about a more implicit validator like what Pydantic does when a value is assigned, versus an explicit call to validate().