Dirk Eddelbuettel: RcppSpdlog 0.0.27 on CRAN: C++20 Accommodations

Version 0.0.27 of RcppSpdlog arrived
on CRAN moments ago, and will
be uploaded to Debian and built for
r2u shortly. The (nice)
documentation
site will be refreshed too. RcppSpdlog
bundles spdlog, a
wonderful header-only C++ logging library with all the bells and
whistles you would want that was written by Gabi Melman, and also includes fmt by Victor Zverovich. You can learn
more at the nice package
documention site.

Brian Ripley has now turned C++20 on as a default for R-devel (aka R
4.6.0 ‘to be’), and this turned up misbehvior in packages using RcppSpdlog such as
our spdl wrapper
(offering a nicer interface from both R and C++) when relying on
std::format. So for now, we turned this off and remain with
fmt::format from the fmt library while we
investigate further.

The NEWS entry for this release follows.

Changes in
RcppSpdlog version 0.0.27 (2026-02-11)

• Under C++20 or later, keep relying on fmt::format until
  issues experienced using std::format can be identified and
  resolved

Courtesy of my CRANberries, there
is also a diffstat
report detailing changes. More detailed information is on the RcppSpdlog
page, or the package documention
site.

This post by Dirk
Eddelbuettel originated on his Thinking inside the box
blog. If you like this or other open-source work I do, you can sponsor me at
GitHub.