I believe RcppNumerical is doing this.

Best
Henrik

> Am 15.11.2023 um 10:37 schrieb Michael Meyer via R-package-devel 
> <r-package-devel@r-project.org>:
> 
> Greetings,
> Suppose I wanted to develop a package with C++ code that contains virtual 
> functions which the package user should define.It's assumed that evaluation 
> is expensive so we do not want to define these in R and then call these 
> R-functions from C++.
> Is this a reasonable idea with a standard solution?Are there packages that do 
> this?
> Thanks in advance for all answers,  
> 
> Michael Meyer
> [[alternative HTML version deleted]]
> 
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