Indeed, man pages are not really suitable for C++ (and many other languages) for the reasons you state.
If you are on a Debian system, run: apt-cache -n search libstdc++ doc and install one of those packages. Then check out its directory in /usr/share/doc.
The docs are also online at http://gcc.gnu.org/onlinedocs/libstdc++/.
A very nice quick reference to iostreams and the STL can be found at http://cppreference.com/.
I have to say I don't really prefer the man pages for C development because often they contain oudated or just plain incorrect information. I prefer to use the glibc manual directly for reference.
Copyright © 2017, Eklektix, Inc.
Comments and public postings are copyrighted by their creators.
Linux is a registered trademark of Linus Torvalds