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various cleanups #3
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@nbsdx this is worse than unnecesary, it prevents the compiler from implement RVO and NRVO which are much more efficient than a move operation. See: http://stackoverflow.com/questions/14856344/when-should-stdmove-be-used-on-a-function-return-value
Reduces 2-phase construction and more efficient in some cases, avoiding object construction if not necessary
Technically this code is limiting the containers to 2B objects or less, a more appropriate fix might be to return an appropriately signed version of size_t
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Various cleanups for efficiency, including removing use of std::move, see notes. The use of std::move you had was actually causing the code to be potentially slower and was at the very least unnecessary.