Since we have rvalue references in C++0x it seems to me that it should be possible to implement std::swap as an atomic operation with CAS. Is this the case in the new standard, and if not why?
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Since we have rvalue references in C++0x it seems to me that it should be possible to implement std::swap as an atomic operation with CAS. Is this the case in the new standard, and if not why?
It is not atomic. Atomic operations are not cheap and 99% of the time you do not need the atomicity. There are (IIRC) some other means to get atomic operations but
std::swap()is not one of them.