Hello, I was wondering if I could suggest adding the ability to have separate allocators inside containers so that the structure (such as map) can be in a different shared memory region, or whatever, than the data. It would have variety of useful cases such as offline storage swapping out, inter-process communications, etc. This can be realized by a bit of a hack with a bunch of boiler-plate code, but I think that this could be a very useful extension over what is available in the standard library. Dave