I thought the standard says that you shouldn't do this sort of thing. You're not allowed to extend the std namespace (so, by implication, you shouldn't alter or overload anything defined in it).
To modify one of Paul's questions slightly: Why on earth would you want to override/overload std::endl? As Paul says, write your own manipulator - it's easy enough, Stroustrup has a whole section on it in TC++PL.
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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