[R-pkg-devel] Virtual C++ functions

[Michael Meyer]

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
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