🚀 go-pugleaf

Hi,
probably it's hard to answer this, but I heard some time ago that it was
possible in some way to give a C/C++ prog a math expression, say
2.*SIN(SQRT(x)) and be able to use it inside your program as a function
you defined (and not, as I thought at first, as a tree you have to
evaluate each time you have a new value for x).
Does somebody know if a library able to do this exists?

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THANKS

        Alessandro Magni
        magni@omega.ien.it