Should you overload swap in the std namespace?

Question

I read something interesting today that said the \'standard\' way to call swap on a user provided type (provided as a template argument) is...

using std::swa         


        

Answer 1

It is legal to provide specializations of standard templates for your own types, and those must go inside the std namespace. So both approaches are legal C++.

That being said, the recommended way is to provide the swap free function in the same namespace as your own type and have ADL pickup your overload from there.

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EDIT: After some of the comments I reread the question and noticed that it mentions overloads in the std namespace. It is illegal to provide overloads in the std namespace, only specializations are allowed.