A C++11 Interface for R's C Interface R package cpp11 version 0.5.5 Provides a header only, C++11 interface to R's C interface. Compared to other approaches 'cpp11' strives to be safe against long jumps from the C API as well as C++ exceptions, conform to normal R function semantics and supports interaction with 'ALTREP' vectors. Software Depends: R (>= 4.0.0) Suggests: bench, brio, callr, cli, covr, decor, desc, ggplot2, glue, knitr, lobstr, mockery, progress, rmarkdown, scales, Rcpp, testthat (>= 3.2.0), tibble, utils, vctrs, withr Davis Vaughan <davis@posit.co> Comprehensive R Archive Network (CRAN) Davis Vaughan [aut, cre] (ORCID: <https://orcid.org/0000-0003-4777-038X>), Jim Hester [aut] (ORCID: <https://orcid.org/0000-0002-2739-7082>), Romain François [aut] (ORCID: <https://orcid.org/0000-0002-2444-4226>), Benjamin Kietzman [ctb], Posit Software, PBC [cph, fnd] MIT + file LICENSE (https://CRAN.R-project.org/package=cpp11/LICENSE) 2026-05-06 application/tgz https://CRAN.R-project.org/package=cpp11 doi:10.32614/CRAN.package.cpp11