A moment ago, Rcpp hit another milestone: 800 packages on CRAN now depend on it (as measured by Depends, Imports and LinkingTo declarations). The graph is on the left depicts the growth of Rcpp usage over time.
The easiest way to compute this is to use the
reverse_dependencies_with_maintainers() function from a helper scripts file on CRAN. This still gets one or false positives of packages declaring a dependency but not actually containing C++ code and the like. There is also a helper function
revdep() in the devtools package but it includes
Suggests: which does not firmly imply usage, and hence inflates the count. I have always opted for a tighter count with corrections.
Rcpp cleared 300 packages in November 2014. It passed 400 packages in June of last year (when I only tweeted about it), 500 packages less than a year ago in late October, 600 packages this March and 700 packages this July. The chart extends to the very beginning via manually compiled data from CRANberries and checked with crandb. The next part uses manually saved entries. The core (and by far largest) part of the data set was generated semi-automatically via a short script appending updates to a small file-based backend. A list of packages using Rcpp is kept on this page.
Also displayed in the graph is the relative proportion of CRAN packages using Rcpp. The four per-cent hurdle was cleared just before useR! 2014 where I showed a similar graph (as two distinct graphs) in my invited talk. We passed five percent in December of 2014, six percent July of last year, seven percent just before Christmas and eight percent this summer.
800 user packages is staggeringly large and humbling number. This puts more than some responsibility on us in the Rcpp team as we continue to keep Rcpp as performant and reliable as it has been.
At the rate we are going, the big 1000 may be hit before we all meet again for useR! 2017.
And with that a very big Thank You! to all users and contributors of Rcpp for help, suggestions, bug reports, documentation or, of course, code.