Itâs easy to create active bindings in R via makeActiveBinding(). This package faciliates the creation of active bindings that link back to C++ code. It provides an interface that allows binding several identifiers in an environment to the same C++ function, which is then called with the name (and a payload) as argument.
It is recommended to use the newer _wrapped functions that support passing an arbitrary Rcpp::List as payload. This allows to store an Rcpp::XPtr to a C++ object in that list. The XPtr then will be released when the payload is garbage-collected, and the C++ object will be destroyed.
You can install bindrcpp from github with:
ExampleThe following C++ module exports a function test_tolower_bindings() that creates active bindings that return the binding name in lowercase.
This function can be called from R:
The bindings are read-only:
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