I assume you can't implement it more effecient as using a default std::swap, which does it with any copyable object, e.g. namespace std { template<class T> void swap(T& lhs, T& rhs) { T tmp=lhs; lhs = rhs, rhs = tmp; } } specializing/oveloading swap makes sence only if you can exchange pointers instead of copying large content (like std::vector or any other collection). With error_code it is not the case. Greetings, Ovanes On Tue, Apr 14, 2009 at 1:22 PM, Marat Abrarov wrote:

Why boost::system::error_code doesn't have swap method (or overloaded swap friend function)? boost::system::error_code is copyable so it must have such "swap". Any opinions?

Best regards, Marat Abrarov.