cppreference.com provides a tag file that allows Doxygen builds to link to its documentation on standard library types (vector, string, standard exception classes, etc.). Using this file in lsst.base would save developers working with Stack code from having to look up these classes by hand. A minor feature, but a convenient one.
One question that would need to be addressed is whether the tag file should be stored in base or downloaded from the website each time. The former is easier (and allows documentation to be built without an internet connection), while the latter would prevent the tag file from going out of date.