cpp4r: Header-Only 'C++' and 'R' Interface

Provides a header only, 'C++' interface to 'R' with enhancements over 'cpp11'. Enforces copy-on-write semantics consistent with 'R' behavior. Offers native support for ALTREP objects, 'UTF-8' string handling, modern 'C++' features and idioms, and reduced memory requirements. Allows for vendoring, making it useful for restricted environments. Compared to 'cpp11', it adds support for converting 'C++' maps to 'R' lists, 'Roxygen' documentation directly in 'C++' code, proper handling of matrix attributes, support for nullable external pointers, bidirectional copy of complex number types, flexibility in type conversions, use of nullable pointers, and various performance optimizations.

Version:	1.3.0
Depends:	R (≥ 4.0.0)
Suggests:	tinytest, rbibutils, litedown
Published:	2026-09-23
DOI:	10.32614/CRAN.package.cpp4r
Author:	Mauricio Vargas Sepulveda [aut, cre], Posit Software, PBC [aut] (Original cpp11 package)
Maintainer:	Mauricio Vargas Sepulveda <m.vargas.sepulveda at gmail.com>
BugReports:	https://github.com/pachadotdev/cpp4r/issues
License:	Apache License (≥ 2)
URL:	https://cpp4r.org, https://github.com/pachadotdev/cpp4r
NeedsCompilation:	no
Materials:	NEWS
CRAN checks:	cpp4r results

Documentation:

Reference manual:

cpp4r.html , cpp4r.pdf

Vignettes:

01 - Introduction (source) 02 - Setup (source) 03 - Package Skeleton (source) 04 - Read-only versus Writable R Objects (source) 05 - Logical Functions (source) 06 - Rolling Functions (source) 07 - Statistical Functions (source) 08 - Logical Functions with Missing Values (source) 09 - Rolling Functions with Missing Values (source) 10 - Statistical Functions with Missing Values (source) 11 - Debugging R Packages (source) 12 - External Pointers (source) 13 - Compiler Optimizations (source) 14 - Linear Algebra (source) 15 - Internals (source) 16 - Worked Examples (source) 17 - FAQs (source)

Downloads:

Package source:	cpp4r_1.3.0.tar.gz
Windows binaries:	r-devel: cpp4r_1.1.0.zip, r-release: cpp4r_1.1.0.zip, r-oldrel: cpp4r_1.1.0.zip
macOS binaries:	r-release (arm64): cpp4r_1.1.0.tgz, r-oldrel (arm64): cpp4r_1.1.0.tgz, r-release (x86_64): cpp4r_1.1.0.tgz, r-oldrel (x86_64): cpp4r_1.1.0.tgz
Old sources:	cpp4r archive

Reverse dependencies:

Reverse imports:	armadillo4r
Reverse linking to:	capybara, economiccomplexity, kendallknight, later2, leontief, lotri, redatam, tinycache

Linking:

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