Stream: helpdesk (published)

Topic: Implementing hash for Point type

Júlio Hoffimann (Mar 25 2023 at 14:22):

In Meshes.jl we have an implementation of == for Point that simply fallsback to isapprox:

https://github.com/JuliaGeometry/Meshes.jl/blob/b2586c911a3d5f04cb8ea5ceff37eb9bd661b308/src/points.jl#L142-L155

By reading the docs of isequal, I learned that we also need to define hash(::Point, h) so that the isequal behaves properly in Set and Dict, etc.

How should I define the hash function for Point in this context of geometric processing? How do you usually implement hash in general?

jar (Mar 25 2023 at 17:30):

https://softwareengineering.stackexchange.com/questions/391100/how-to-implement-float-hashing-with-approximate-equality

Júlio Hoffimann (Mar 26 2023 at 12:45):

Very educative thread @jar thanks for sharing. We will probably refactor some ideas in Meshes.jl accordingly.

Last updated: Oct 02 2023 at 04:34 UTC