Tuple progress - help with istream / ostream

[Paolo Carlini]

Matt Austern wrote:

> Wait until next week until you do any of this.  Things may change 
> between now and then.

Hi Matt,

while we are at it, I have, maybe, a (very minor) issue with 6.2.2: 
since zero-sized 'array' is legal, isn't slightly misleading having "T 
elems[N];" among the members, even as "Exposition only"?

Paolo.