DocumentationHackReferenceClassHH\Setimmutable

HH\Set::immutable

Returns an immutable (ImmSet), deep copy of the current Set

public function immutable(): ImmSet<Tv>;

This method is interchangeable with toImmSet().

Returns

ImmSet<Tv> - an ImmSet that is a deep copy of the current Set.

Examples

function expects_immutable(ImmSet<string> $is): void {
  \var_dump($is);
}

<<__EntryPoint>>
function basic_usage_main(): void {
  $s = Set {'red', 'green', 'blue', 'yellow'};

  // Get a deep, immutable copy of $s
  $immutable_s = $s->immutable();

  expects_immutable($immutable_s);
}