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pdv reviews and mentions
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Invariants: A Better Debugger?
I could see C++ or Rust maybe adding that eventually, but it seems unlikely for Zig unless they relax some of their core design goals. The problem with invariant assertions is figuring out when exactly they should run, and that idea that something might run _every_ time any public method is called or whatever definitely conflicts with the design they're going for.
That said, Zig does make it pretty easy to handle a lot of the features you might want. As a library, you can offer the ability for a person to rewrite a type (maybe only in non-optimized modes if you want) and check the invariants before/after every public function call. You can always add explicit pre/post-condition checks to any function you'd like. Invariants in your inputs/outputs can be hoisted to the type checker (I wrote a toy project doing this [0]). Like...at some point you have to describe what you want to check and when you want it to run for the invariant checking to be useful, and Zig allows you to write the checks and use comptime magic to place them where you want them to run, all in the userspace of the language. Which language features would you like to make the process smoother (automatic subtype resolution on a lattice of constraints, a bit of syntax, ...)?
[0] https://github.com/hmusgrave/pdv
- Parse, Don't Validate (2019)
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hmusgrave/pdv is an open source project licensed under GNU Affero General Public License v3.0 which is an OSI approved license.
The primary programming language of pdv is Zig.
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