Favourite class in the standard?

What would your favourite class anywhere in the C++ standard be?

Mine's probably stringstream, as I just learned about that and am finding it quite useful.
std::string probably :)
My favorite is std::valarray -- expression templates made easy!
I like std::vector.
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std::exception (seriously).

To be fair, I rarely use the standard classes.

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If you're like I am, you abuse std::vector to read binary files.
Whereas we should have been provided memory mapped file libraries, a long time ago.
Boost has portable memory mapped file I/Ô, so there is a chance.
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