Online manual (man) pages provide immediate documentation about a command, function, subroutine, or collection of such things.
You can display a man page by running the command:
example% man topic
Throughout the C++ documentation, man page references appear with the topic name and man section number: CC(1) is accessed with man CC. Sections other than 1 (ieee_flags(3M) for example) would be accessed with the -s option on the man command as follows:
example% man -s 3M ieee_flags