You're replying to a comment by Mattias.

Mattias Permalink
May 18, 2010, 14:40

Just to add a bit: C++ functors would typically inherit from std::unary_function or std::binary_function.
In the example in the article it doesn't matter much, but for other cases it does.
It is explained a bit more here:
Benefits of letting functors inherit from std::unary_function...

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