var.visitNogc

visitNogc is a no-GC variant of visit.

It performs the same type-based dispatch as visit, but is annotated @nogc.

Notes:

• Any chosen handler must also be @nogc.
• Unlike visit, the fallback handler accepting var receives the original value (or var.init for NULL) without allocating.

  Parameters

  handlers

  One or more callable handlers for different types.

  Returns

  The result of calling the matched handler, or R.init if no handler matches.