Try GNU.
I don't have the URL, but go to www.gnu.org, and there are a couple of links to their documentation pages.
GNU stands for free software, and that includes free documentation. They have the full docs for the compilers suite and a (large) guide to C++ itself.
If you find GNU useful, try and find a way of supporting their work. Although we work on something we call Linux, it is in fact a whole mix of programs from various sources, and one of the main sources is the GNU project.
cheers jalal
That's what It thought too. ISTR years ago there was some kind of C/C++ documentation from GNU. There's the CommonC++ library stuff, but that's not Stroustrup & Ellis in electronic form. Oh well, I have it in hard copy. I also recall the documentation in KDevelop used to work, but that was perhaps three years ago.