pub unsafe extern "C" fn GxB_Vector_extractElement_FC64(
x: *mut GxB_FC64_t,
v: GrB_Vector,
i: GrB_Index,
) -> GrB_Infopub unsafe extern "C" fn GxB_Vector_extractElement_FC64(
x: *mut GxB_FC64_t,
v: GrB_Vector,
i: GrB_Index,
) -> GrB_Info