'Rcpp'-Based Helper Functions to Pass 'Int64' and 'nanotime' Values Between 'R' and 'C++' R package RcppInt64 version 0.0.5 'Int64' values can be created and accessed via the 'bit64' package and its 'integer64' class which package the 'int64' representation cleverly into a 'double'. The 'nanotime' packages builds on this to support nanosecond-resolution timestamps. This packages helps conversions between 'R' and 'C++' via several helper functions provided via a single header file. A complete example client package is included as an illustration. Software Imports: Rcpp (>= 1.0.8) LinkingTo: Rcpp Suggests: tinytest, bit64, nanotime Dirk Eddelbuettel <edd@debian.org> Comprehensive R Archive Network (CRAN) Dirk Eddelbuettel [aut, cre] (ORCID: <https://orcid.org/0000-0001-6419-907X>) GPL (>= 2) 2024-04-30 application/tgz https://CRAN.R-project.org/package=RcppInt64 doi:10.32614/CRAN.package.RcppInt64