This folder contains primitive functors that implement common computations and patterns usable in a variety of situtations.

Examples for such functors include:

• LBM primitives such as functions to compute equilibria, recover moments and so on
• (inter,extra)polation schemes
• Basic ODE solvers
• Geometry primitives such as signed distance functions

Such functors can be simple free (template) functions or non-virtual classes.

All functionality contained in this folder must be declared any_platform and be executable both on CPUs and GPUs.