Select Stream

1 Version

Routes one of N same-typed candidate streams t to the output, chosen each tick by a leading UInt64 index. The index controls routing only; the output is the selected candidate of type t, forwarded unchanged.

How it fits

Typical backends

Mode-driven routing — a control index plus per-mode candidate streams pick the active branch, whose value is serialised out.

A/B comparison switch — two same-typed candidates and a selector index choose which to forward to a viewer.

Caveats

Hard constraintAll candidates must share one type t. The leading UInt64 index routes only and never reaches the output, which is exactly t; routing differently-typed sources belongs in pack_union / unpack_union instead.
I/O contractAll candidate streams must tick together; values on the unselected inputs are dropped for that tick, and an out-of-range index produces no output that tick.

Versions

f43cec87defaultlatestTransformation
10/12/2023