Function gmsh_sys::gmshModelAddPhysicalGroup

pub unsafe extern "C" fn gmshModelAddPhysicalGroup(
    dim: c_int, 
    tags: *mut c_int, 
    tags_n: usize, 
    tag: c_int, 
    ierr: *mut c_int
) -> c_int

Add a physical group of dimension dim, grouping the model entities with tags tags. Return the tag of the physical group, equal to tag if tag is positive, or a new tag if tag < 0.