C++11 allocator compliant unordered containers

[François Dumont]

Hi

     I am working on making unordered containers C++11 allocator 
compliant. In assignment operator I would like, when the allocator let 
me do it, reuse existing nodes rather than reallocating everything. To 
do so I use the copy assignment operator on the value_type. On 
unordered_set no problem, on unordered_map value_type is pair<const Key, 
Value> which is not copy assignable.

     So can I consider in this context that I have a pair<Key, Value> or 
should I never reuse existing nodes ? I know that you are working on the 
equivalent for std::set and std::map Jonathan. Have you come to the same 
question ?

François