Function wrap_to_first_bz

cpp_core/src/kpoints.cpp:10–13

namespace {

double wrap_to_first_bz(double value) {
    // Wrap to [-0.5, 0.5) in reduced reciprocal coordinates.
    return value - std::floor(value + 0.5);
}

double wrap_kpoint_component(double value) {
    double wrapped = wrap_to_first_bz(value);