def set_checked

bend-collections@1.0.0.0 · src/containers/internal/dlist_storage.bend:246

import Base
import bend-collections@1.0.0.0/src/containers/types/internal_dlist.bend as E

246# set swaps the new value in: one indexed access when the element is live;
247# a stale slot is None and is written back as None.
248def set_checked(~T: Data, ok: Bool, +tag: U32, +fresh: U32, +free: U32, +count: Nat, +head: U32, +tail: U32, +depth: Nat, +cap: U32, vals: Array<Maybe<&2, T>>, prevs: Array<U32>, nexts: Array<U32>, +i: U32, +x: T, same: Bool) -> DList<T> & Result<&2, &2, E.Error, Unit>:
249  match ok same:
250    case _ False{}:
251      (DL{tag, fresh, free, count, head, tail, depth, cap, vals, prevs, nexts}, Fail{E.ForeignHandle{}})
252    case False{} True{}:
253      (DL{tag, fresh, free, count, head, tail, depth, cap, vals, prevs, nexts}, Fail{E.StaleHandle{}})
254    case True{} True{}:
255      set_fin(~T, tag, fresh, free, count, head, tail, depth, cap, prevs, nexts, i, x, Array.swap(Maybe<&2, T>, vals, i, Some{x}))