[Rcpp-devel] template argument deduction/substitution failed

Dirk Eddelbuettel edd at debian.org
Sun Jun 13 01:15:01 CEST 2021

On 12 June 2021 at 16:02, Kevin Ushey wrote:
| I think you're bumping into the 20 argument limit for our (now rather old)
| Vector::create() implementation. I thought we also had a variadic C++11
| version for this, but apparently I am mistaken...

Hm. We have a few header files that are similarly macro-generated (and
sometimes the macro code is behind ...) but I also thought we had this
generalized with variadic arguments. Maybe not.
| A workaround is to use something like the ListBuilder class I put together
| a while back here:
| https://stackoverflow.com/questions/27371543/how-many-vectors-can-be-added-in-dataframecreate-vec1-vec2/27371771#27371771

Maybe we can carry that over now that C++11 is the minimum standard for R ?

| but on our side, it would be nice to have a variadic create for when C++11
| and above is supported / enabled by the compiler.

I have been mulling an idea regarding a top-level header file choice also
signaling minimal language standards opening the door a little to C++14,
C++17, C++20, ... . I should open an issue ticket one of these days.


https://dirk.eddelbuettel.com | @eddelbuettel | edd at debian.org

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