libfparser4 - 4.5.2-2+b2 main

This C++ library offers a class which can be used to parse and evaluate a
mathematical function from a string (which might be eg. requested from the
user).
.
The syntax of the function string is similar to mathematical expressions
written in C/C++ (the exact syntax is specified in the documentation below).
The function can then be evaluated with different values of variables.