struct test

    class test{}

    class a extends \ILLI\Base\Component\Structure\aStructure
    {
        private $__test = NULL;

        public function __construct()
        {
            $this->__test = new Test;

            $this->tStructure_define('functionName', [
                Prop::FLAG  => Flag::REQUIRED | Flag::EXPECT_WHITELIST,
                Prop::INITIAL   => NULL,
                Prop::TYPE  => ['string'],
                Prop::WHITELIST => ['foo', 'bar', $this->__test], // Flag::EXPECT_WHITELIST set: foo is allowed!
                Prop::BLACKLIST => ['foo', 'bob'],
                Prop::ON_COMPARE    => function($value)
                {
                },
                Prop::ON_SET    => [
                    function($value)
                    {
                        //throw new \Exception('boo');
                        return $value;
                    }
                ],
            ]);

            $this->tStructure_define('name', 'string');
            $this->tStructure_define('lastName');
        }

        public function validate($__field, $__value)
        {
            switch($__field):
                case 'name':
                    return substr($__value, 0, 2) !== '__';
                    break;
                case 'lastName':
                    return $__value !== 'CH';
                    break;
            endswitch;
        }
    }

    $a = new a;
    $a->functionName = 'bab'; // ValueComparisonWhitelistException
    //$a->functionName = new Test; // ValueExpectedException: strict compare
    var_dump($a);