std::ostringstream woes

Question

I can do

std::ostringstream oss;
oss << 1;
oss.str();

so why can't I do:

((std::ostringstream()) << 1).str() ?

Thanks!

See also: http://stackoverflow.com/questions/1540831/stringstream-temporary-ostream-return-problem for interesting issues with the use of temporary stringstreams. — Éric Malenfant, Feb 03 '10 at 23:01

score 11 · Accepted Answer · answered Feb 03 '10 at 22:58

11

The << operator returns the base type ostream, while the str member function exists only on the derived type ostringstream.

answered Feb 03 '10 at 22:58

interjay

1

(oss<<1).str() fails the same way. ostream doesnt support str() – pm100 Feb 03 '10 at 23:03
could you cast it back up to an ostringstream? – Inverse Feb 04 '10 at 06:02

1 Answers1