[R-pkg-devel] warning: binary constants are a C++14 feature or GCC extension

[Dan Zigmond]

Thank you! That's very helpful.

     Dan

.
--------------------------
Dan Zigmond
djz using shmonk.com



On Sat, Nov 21, 2020 at 5:14 PM David Kepplinger <david.kepplinger using gmail.com>
wrote:

> Dear Dan,
>
> As the warning says, the binary notation you use is only valid with
> C++14 and onwards. You can either add SystemRequirements: C++14 to
> your DESCRIPTION file, or use decimal (or hex) notation.
>
> In my opinion it's even better to name your constants to convey their
> meaning to the reader of the code. Then it wouldn't be a big issue if
> you use binary, decimal, or hex notation.
>
> Best,
> David
>
> On Sat, Nov 21, 2020 at 4:59 PM Dan Zigmond <djz using shmonk.com> wrote:
> >
> > Hi, all. In re-submitting a package to CRAN, I'm getting the following
> > warnings in the Debian pre-test:
> >
> > Found the following significant warnings:
> >   sort.cpp:12:28: warning: binary constants are a C++14 feature or GCC
> extension
> >   sort.cpp:12:43: warning: binary constants are a C++14 feature or GCC
> extension
> >
> > I added some C++ code to speed up the package and the warnings refer to
> > this line of C++:
> >
> >    while ((s[p + length] & 0b11000000) == 0b10000000) {
> >
> > The line has to do with parsing UTF-8 strings by figuring out how many
> > bytes are used in each character. Is the 0b... notation not allowed in
> > CRAN? I could substitute decimal constants, but that will be a bit more
> > obtuse. The other platforms seems to allow this; only the Debian check
> > failed.
> >
> >      Dan
> >
> > .
> > --------------------------
> > Dan Zigmond
> > djz using shmonk.com
> >
> >         [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-package-devel using r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-package-devel
>
>
>
> --
> David Kepplinger, PhD
> https://www.dkepplinger.org
>

	[[alternative HTML version deleted]]