You can browse C++ class hierarchies from within Emacs by using Ebrowse.

This file documents Ebrowse, a C++ class browser for GNU Emacs.

Overview What is it and how does it work?
Generating browser files How to process C++ source files
Loading a Tree How to start browsing
Tree Buffers Traversing class hierarchies
Member Buffers Looking at member information
Tags-like Functions Finding members from source files
GNU Free Documentation License The license for this documentation.
Concept Index An entry for each concept defined

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(a) The FSF's Back-Cover Text is: “You have the freedom to copy and modify this GNU manual.”