std::string — small string optimization and swap

Question

From N3290, [container.requirements.general]:

The expression a.swap(b), for containers a and b of a standard container type other than array, shall exchange the values of a and b without invoking any move, copy, or swap operations on the individual container elements.

How do this interact with small string optimization? Did they forget to add std::string too?

Answer 1

(Reposting from comment)

std::string is not a container – the fact that basic_string is not described in the Containers library chapter (§23) of the FDIS is a good clue. ;-]