def take.of

bend-kit-http2@0.4.0.0 · hpack.bend:147

import Base
import bend-kit-bytes@0.3.3.0/bytes.bend as Bytes

147def take.of(r: Bytes.Bytes & Maybe<&2, U32>, +at: U32, +length: U32) -> Maybe<&1, Cursor & U32>:
148  (b, m) = r
149  match m:
150    case None{}:
151      None{}
152    case Some{value}:
153      Some{(Cursor{b, (at + 1 : U32), length}, value)}