num::spatial::debug::verify_lattice_symmetry

Defined in header <spatial/debug.hpp>

template <class P>
requires periodic_neighbourhood_2d<P>
void verify_lattice_symmetry(
    const P &lattice, std::source_location loc = std::source_location::current());

Verify that a periodic lattice's neighbour tables are mutually consistent.

Stepping up from a site and then down must return to it, and likewise left and right. A table built with the wrong modulus satisfies neither.