Pinq\Analysis\Types\Type::getUnaryOperation PHP Method

    public function getUnaryOperation(O\UnaryOperationExpression $expression)
    {
        if (isset($this->unaryOperations[$expression->getOperator()])) {
            return $this->unaryOperations[$expression->getOperator()];
        }
        return $this->parentType->getUnaryOperation($expression);
    }