The package contains template classes in the RcppGSL namespace that act as smart pointers to the associated GSL data structure. For example, a RcppGSL::vector<:double> object acts a smart pointer to a gsl_vector*. Having the pointer shadowed by a smart pointer allows us to take advantage of C++ features such as operator overloading, etc … which for example allows us to extract an element from the GSL vector simply using  instead of GSL functions gsl_vector_get and gsl_vector_set
The package contains a 11 pages vignette that explains the features in details, with examples. The vignette also discusses how to actually use RcppGSL, either in another package (preferred) or directly from the R prompt through the inline package.