pass_by_reference.hack

<?hh

function pass_by_value(shape('key' => string) $args ): void {
	$args['key'] = "modified";
}

function pass_by_reference(inout shape('key' => string) $args ): void {
	$args['key'] = "modified";
}

<<__EntryPoint>>
function will_it_change() : void {
	$s = shape('key' => 'original');
	echo("in outer un, have key ". $s['key']."\n");
	pass_by_value($s);
	echo("in outer un, now have key ". $s['key']."\n\n");

	$t = shape('key' => 'original');
	echo("with inout: in outer un, have key ". $t['key']."\n");
	pass_by_reference(inout $t);
	echo("in outer un, now have key ". $t['key']."\n");
}