withProgressCallback

CreateOpts withProgressCallback(CreateOpts co,
       void  delegate(const(char)[])  nothrow @nogc onMessage,
       void  delegate(const(char)[])  nothrow @nogc onTreated)

@safe @nogc nothrow

Sets progress callbacks for archive creation.

Parameters

`onMessage`	receives human‑readable messages (may be null)
`onTreated`	receives each treated file path (may be null)