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Provide a swap member function when std::swap would be inefficient for your type. Make sure your swap doesn't throw exceptions.
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If you offer a member swap, also offer a non-member swap that calls the member. For classes (not templates), specialize std::swap, too.
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When calling swap, employ a using declaration for std::swap, then call swap without namespace qualification.
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It's fine to totally specialize std templates for user-defined types, but never try to add something completely new to std.
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