multi-char key

[Andrea Crotti]

I have a small problem with semantic and completion.
In C++ it's very nice to have completion after
"::"
So I did this

  (defun my-cpp-cedet-hook ()
    (local-set-key ":" 'semantic-complete-self-insert))

and it sort of works, the problem is that it starts to look for also
after the first ":", becoming quite slower.
It should be instead be smart enough to look for only after two ":", is
that somehow possible??