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    Actually, paragraph 3 says: A space-optimized representation of bits is recommended. Not quite a requirement. Commented Feb 28, 2013 at 3:56
  • @jogojapan: That was added in C++11. That wasn't present in C++03 (which was what I was actually quoting). In any case, I don't know of an implementation that uses a non-bitwise implementation; unless one exists, your point is pretty much moot anyway. Commented Feb 28, 2013 at 4:06
  • Right, I wasn't aware of the C++03/11 difference there. In any case, I think it's useful to make correct statements in SO answers, even if certain aspects are moot. Commented Feb 28, 2013 at 4:20
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    @jogojapan: I believe it is correct as stated. The only part that's open to question is whether the change in C++11 is enough to merit updating the answer to reflect the change. Commented Feb 28, 2013 at 4:43