On empty member optimization on comparator in stl_tree...

[Paolo Carlini]

Sylvain Bougerel wrote:
> Sorry for all these questions, I'm just looking for answers in order
> to have a better understanding of the library and in order to get
> better at coding C++.
>   
The code you can see now is just a "placeholder" for the actual
empty-member optimization which at some point has been quickly
attempted, then reverted the last minute before the ABI freeze, and now
cannot be properly implemented because of the ABI freeze itself. The
next occasion it will, if not earlier when the ABI will be certainly
broken in the C++1x library.

Paolo.