pub unsafe extern "C" fn manifold_calculate_curvature(
mem: *mut c_void,
m: *mut ManifoldManifold,
gaussian_idx: c_int,
mean_idx: c_int,
) -> *mut ManifoldManifold
pub unsafe extern "C" fn manifold_calculate_curvature(
mem: *mut c_void,
m: *mut ManifoldManifold,
gaussian_idx: c_int,
mean_idx: c_int,
) -> *mut ManifoldManifold