Function GrB_Matrix_apply 

pub unsafe extern "C" fn GrB_Matrix_apply(
    C: GrB_Matrix,
    Mask: GrB_Matrix,
    accum: GrB_BinaryOp,
    op: GrB_UnaryOp,
    A: GrB_Matrix,
    desc: GrB_Descriptor,
) -> GrB_Info