[Rcpp-devel] How to modifying the elements of a list in the global environment?

[Christian Gunning]

> Giovanni,
>
> Anything you pass from R into your C++ routine should be considered
> read-only. It's typically a bad idea to do in-place updates of the R
> object you passed in as an argument.

Really?  I was under the impression that the ability of in-place
modification was a conscious design decision.
Be aware that you've stepped outside of the functional programming
paradigm, yes.
But read-only?  From the C++ point of view, it's just memory.

That said, if you want safety (e.g. default R behaviour), use clone().
 Then you can modify to your heart's content.
-Christian

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