Re: Can operator= assign const member?
Good grief. I was playing about trying to make sense of the relevant section in the standard (5.2.11), and I got the process to work, so I thought I'd let people know. I didn't expect the Spanish Inquisition... 
And yes, the swap trick is about exception safety. I could have simplified the code, but I routinely write my assignment operators that way, so that's how it got written. If you can't see why it's exception safe, then I suggest you read Exceptional C++ for all the gory details.
Correct is better than fast. Simple is better than complex. Clear is better than cute. Safe is better than insecure.
-- Sutter and Alexandrescu, C++ Coding Standards
Programs must be written for people to read, and only incidentally for machines to execute.
-- Harold Abelson and Gerald Jay Sussman
The cheapest, fastest and most reliable components of a computer system are those that aren't there.
-- Gordon Bell
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