Is STL important?

Quote:

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Originally Posted by JohnW@Wessex

e.g.
You often need to drive from std::unary_function and std::binary_function to create adaptable function objects for use in STL algorithms.

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Where do you need to derive from these in order to use the STL? I think they are just a handy way to create the correct typedef's in your function objects that will be used by template functions. You could just as well provide the typedef's yourself and remove the inheritance of std::unary_function or std::binary_function.