Calling assignment operator in copy constructor

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Yes, that’s a bad idea. All member variables of user-defined types will be initialized first, and then immediately overwritten.

That swap trick is this: 

Foo& operator=(Foo rhs) // note the copying
{
   rhs.swap(*this); //swap our internals with the copy of rhs
   return *this;
} // rhs, now containing our old internals, will be deleted

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