dcsimg

A Powerful Function Parser

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The inspiration to write this code was to have an easy-to-use parser for functions given as string. You have a string like

"cos(x)-7*x/(1+x)"
and you want to compute some values, maybe for displaying the graph of the function. You can write code like this:

CFunction<long double>* fkt = 
  CFunction<long double>::Parse("cos(x)-7*x/(1+x)");

long double y = fkt->Execute(1.5);

There are lots of definitions in the background, but the result is easy and fast! There is a one-time pasing step to construct the function tree, and function evaluations are only calls of standard math functions like sin, +, *, sqrt. When you want to know details about the implementaion, you should look into the source code. It would be too complex to describe the parsing algorithm here.

Downloads

Download demo source - 50 Kb
Download demo application - 32 Kb


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