Welding C++ and R code together
Read and write rectangular data (like 'csv', 'tsv' and 'fwf') quickly into R.
High precision timing of R expressions
A cross-platform, uniform interface to file system operations.
Interpreted String Literals for R
Connect to ODBC Compatible Databases (using the DBI Interface).
Track and report code coverage for your package and (optionally) upload the results to a coverage service like [Codecov](http://codecov.io) or [Coveralls](http://coveralls.io).