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From: Dave (dave_at_[hidden])
Date: 2001-08-29 18:00:51

> Let's model concept refinement by inheritance in C++. This is already done
> in the C++ standard with the iterator tags (std::forward_iterator_tag derives
> from both std::input_iterator_tag and std::output_iterator_tag),

Well, yes, the idea is valid, although the Standard
specifies that std::forward_iterator_tag derives only
from std::input_iterator_tag. Maybe we can cite a
different example....

     -- Dave Miller

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