Equation Parsing Library C++ [closed]

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I'm sure there must be something like this somewhere but I can't seem to find anything useful on here or Google. I had hoped Boost might have something but alas not.

What I'm after is a lightweight library that can take a string from the user, for example "y=2x+3" and parse it returning an object or function which returns y when given x.

Can anybody recommend something for this? (Worst case I could write one myself but no point reinventing the wheel and all.)

Things which can be assumed if necessary;

• Preset variable names
• Number of variables fixed

Answer 1

MuParser is all you ever could wish for. You can even define custom operators, store and evaluate the expressions in binary form, etc... Written in C++, bindings for C and C# (and maybe even other languages).