Excessive memory usage of large hash_maps

[Gabriel Dos Reis]

Benjamin Kosnik <bkoz@redhat.com> writes:

| Sorry I've taken so long to get to this.
| 
| >Didn't realize you were doing that!  I was planning to rewrite the TR1 
| >version of hash tables once we'd set up the infrastructure for where we'll put 
| >TR extensions.
| 
| I would suggest writing this, and then we'll add it. 
| 
| I think the proposals for adding TR1 bits are mostly spot-on. Ie, use
| include/tr1, and namespace tr1.
                   ^^^^^^^^^^^^^

Just to clairy: it is std::tr1.

| I would add that I think all TR1 code should not go into libstdc++.so
| (hello, versioning nightmare!) and instead go into a separate library,

Why?  Codes that do not use TR1 component are not affected.  We
version only symbols involved in standard C++.

-- Gaby