Stack-buffer based STL allocator?

It really depends on your requirements, sure if you like you can create an allocator that operates only on the stack but it would be very limited since the same stack object is not accessible from everywhere in the program as a heap object would be.

A stack-based STL allocator is of such limited utility that I doubt you will find much prior art. Even the simple example you cite quickly blows up if you later decide you want to copy or lengthen the initial lstring.

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