pub unsafe extern "C" fn manifold_cross_section_vec_get(
mem: *mut c_void,
csv: *mut ManifoldCrossSectionVec,
idx: c_int,
) -> *mut ManifoldCrossSection
pub unsafe extern "C" fn manifold_cross_section_vec_get(
mem: *mut c_void,
csv: *mut ManifoldCrossSectionVec,
idx: c_int,
) -> *mut ManifoldCrossSection