WEBINAR: On-demand webcast
How to Boost Database Development Productivity on Linux, Docker, and Kubernetes with Microsoft SQL Server 2017 REGISTER >
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.
DownloadsDownload demo source - 50 Kb
Download demo application - 32 Kb