Ref5 method

P Ref5([
  1. X? o
])

Allocates o into slot '5', or reuses the existing slot '5' allocation if o is null.

Intended as a short-lived scratch reference within a single C call. Use RefUpdate5 if the callee may write back into the pointer.

Implementation

P Ref5([X? o]) => _Ref(o, '5');