seeking embeddable statement compiler code

I need some algo code, described below. It's not for homework, that
stopped 30 years ago, it's for a custom process engineering analysis
tool.


I'm seeking a function set - either C++ code or MSVC linkable object,
that will input a text string of a mathematical expression and either
output an efficient codified form (eg. Intel math copro machine code),
or allow a reasonably efficient direct interpretation from the text
itself, then separately perform the evaluation.


The expression needs to be able to contain 4 variable elements whose
values can be adjusted on consecutive calculations. Typically, it
would be something like:


a * ( b + cos(2.5 - c) * sqrt(d))


Typically, one function would read the input string and generate the
codified version. A second function would insert the values for the 4
variables then evaluate the expression.


Any direction much appreciated.

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