Is there a libXrandr API documentation?

Question

I want to use libXrandr in C++. Is there a suitable documentation?

Answer 1

See project page and project repository.

Reasonable Linux distributions come with man pages, which might be split-off into a -devel package (for example on Slackware you need libXrandr, on openSUSE it would be libXrandr-devel) - Xrandr(3) is a good starting point.