You might be interested in boost::optional, even if only as a point of comparison: http://boost.org/doc/libs/1_38_0/libs/optional/doc/html/index.html http://boo

You might be interested in boost::optional, even if only as a point of comparison: http://boost.org/doc/libs/1_38_0/libs/optional/doc/html/index.html http://boost.org/doc/libs/1_38_0/libs/optional/doc/html/inde...