A 'C++20' API for R R package cppally version 0.1.0 A header-only 'C++20' API for manipulating R data structures from 'C++'. Provides 'C++20' concepts specific to R, custom scalar and vector classes with built-in NA handling, automatic object protection, 'SIMD' (single-instruction-multiple-data), parallelisation, and a streamlined system for registering 'C++' functions, including templates, to R. Full API reference and documentation are available at <https://nicchr.github.io/cppally/>. Software Depends: R (>= 4.5.0) Suggests: bench, bit64, brio, callr, cli, cpp11, decor, desc, devtools, fs, glue, knitr, pkgload, purrr, readr, rmarkdown, roxygen2, rstudioapi, stringr, testthat (>= 3.0.0), usethis, vctrs, withr Nick Christofides <nick.christofides.r@gmail.com> Comprehensive R Archive Network (CRAN) Nick Christofides [aut, cre, cph] (ORCID: <https://orcid.org/0000-0002-9743-7342>), Martin Leitner-Ankerl [cph] (Author of bundled ankerl::unordered_dense library), Malte Skarupke [cph] (Author of bundled ska_sort library), Posit Software, PBC [cph] (SEXP protection mechanism in r_protect.h inspired by cpp11) MIT + file LICENSE (https://CRAN.R-project.org/package=cppally/LICENSE) 2026-04-28 application/tgz https://CRAN.R-project.org/package=cppally doi:10.32614/CRAN.package.cppally