pub unsafe extern "C" fn manifold_union(
mem: *mut c_void,
a: *mut ManifoldManifold,
b: *mut ManifoldManifold,
) -> *mut ManifoldManifold
pub unsafe extern "C" fn manifold_union(
mem: *mut c_void,
a: *mut ManifoldManifold,
b: *mut ManifoldManifold,
) -> *mut ManifoldManifold