Function gmsh_sys::gmshModelMeshFieldAdd

pub unsafe extern "C" fn gmshModelMeshFieldAdd(
    fieldType: *const c_char, 
    tag: c_int, 
    ierr: *mut c_int
) -> c_int

Add a new mesh size field of type fieldType. If tag is positive, assign the tag explicitly; otherwise a new tag is assigned automatically. Return the field tag.