Function GrB_Vector_extract 

pub unsafe extern "C" fn GrB_Vector_extract(
    w: GrB_Vector,
    mask: GrB_Vector,
    accum: GrB_BinaryOp,
    u: GrB_Vector,
    I_: *const GrB_Index,
    ni: GrB_Index,
    desc: GrB_Descriptor,
) -> GrB_Info