The command C-c C-m a can be used to display all members matching a given regular expression. This command can be very useful if you remember only part of a member name, and not its beginning.
A special buffer is popped up containing all identifiers matching the regular expression, and what kind of symbol it is (e.g., a member function, or a type). You can then switch to this buffer, and use the command C-c C-m f, for example, to jump to a specific member.