Classes and Methods for Fast Memory-Efficient Boolean Selections
Jens Oehlschlägel [aut, cre], Brian Ripley [ctb]
testthat (>= 0.11.0), roxygen2, knitr, rmarkdown,
microbenchmark, bit64 (>= 4.0.0), ff (>= 4.0.0)
Provided are classes for boolean and skewed boolean vectors,
    fast boolean methods, fast unique and non-unique integer sorting,
    fast set operations on sorted and unsorted sets of integers, and
    foundations for ff (range index, compression, chunked processing).