do allocators have to be stateless?



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Is there a requirement for allocator to be stateless?

I need a std::set that will throw an exception when it's size reaches
some (run-time determined) size. Thought it would be just a simple
matter of providing allocator tracking how many items are already
allocated and throwing when the max is reached .

Unfortunately, the exception is being thrown from the default std::set
constructor, and allocator seems to be uninitialized... :(

The allocator in question is a copy of Josuttis's example with
current_size and max_size members added. Of course, they are
initialized in a constructor, which apparently is not being called.

Any thoughts?
.

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