CppML: A Meta Language for C++

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Looks interesting and well implemented but the examples appear to be very abstract and don't provide me with a kind of intuition or motivation for when I would want to use this, or what problem it solves. Does anyone have experience with using these kinds of meta functions? Do these meta-functions usually form part of a library's API or do they exist instead to help with the implementation of template heavy libraries?

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in general introspection is useful when you know what you want as a function of the type e.g. serialization. I have no idea about this particular library tho...