What does `` provide, and where is it documented?

Question

The new C++11 standard mentions a header , presumably in analogy to C99\'s .

Now, we know that C++11 brings n

Answer 1

Probably the best documentation of which I'm aware is in n1326, the proposal to add TR19769 to the C standard library [Edit: though looking at it, the N1010 that R. Martinho Fernandes cited seems to have pretty much the same].