-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Thursday 26 June 2008 10:51 am, David Abrahams wrote:
Don't you think it /always/ makes sense to provide a custom swap overload for a Swappable type, as long as it outperforms the default std::swap, in one way or the other?
That's the whole question. I'm not 100% sure.
I'd say if the default std::swap compiles for the type, then there is no reason not to provide a more efficient swap specialization. The only question for me would be in a case where the type is not assignable/copy constructible. Then you might want to have a compile error instead of a non O(1) swap. But given that the default std::swap can in reality already have arbitrary complexity, depending on the complexity of a type's assignment/copy constructor, I don't see much value in producing a compile error. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iD8DBQFIY7Xf5vihyNWuA4URArlXAKDFqOtlL14dwWbVODm2cKHv8N+KGACdGkKR a3I9hVHxt2AEl6iLLffROfE= =HMY+ -----END PGP SIGNATURE-----