Rcpp syntactic sugar

This note describes Rcpp sugar which has been introduced in version 0.8.3 of Rcpp (Eddelbuettel, François, Allaire, Chambers, Bates, and Ushey, 2014; Eddelbuettel and François, 2011). Rcpp sugar brings a higher-level of abstraction to C++ code written using the Rcpp API. Rcpp sugar is based on expression templates (Abrahams and Gurtovoy, 2004; Vandevoorde and Josuttis, 2003) and provides some ’syntactic sugar ’ facilities directly in Rcpp. This is similar to how RcppArmadillo (François, Eddelbuettel, and Bates, 2014) offers linear algebra C++ classes based on Armadillo (Sanderson, 2010).