RInside is an open source development toolkit featuring C++ classes to embed R in C++ applications. RInside will make it a lot easier to have `R inside` your C++ application by providing a few wrapper classes.
As R itself is embedded into your application, a shared library build of R is required.
RInside works on Mac OS X, Linux, and even on Windows provided you use the same tools used to build R itself.
Detailed usage information for RInside is available here.