Sorry, accidental gmail send... here's what I meant:
On Sat, Apr 12, 2014 at 11:06 PM, Dirk Eddelbuettel <[email protected]> wrote:
> What can work as a single expression in R sometimes needs to be disentangled
> at the C++ level to help the compiler find its way through all the templates.
>
[snip]
>
> // [[Rcpp::export]]
> NumericVector fromList(List outer, std::string name) {
> List inner = outer[0]; // 0-based offsets in C++
> return inner["p"];
> }
I've noticed (I think...) having to do this sort of thing, but I want
to ask a question to clarify: is it possible to have the above code
work, but if you instead try:
NumericVector fromList(List outer, std::string name) {
return (outer[0])["p"];
}
or even:
NumericVector fromList(List outer, std::string name) {
NumericVector vec = (outer[0])["p"];
return vec;
}
It will fail to compile? That's what you mean by needing to "help the
compiler"? If so,
is there some terminology for these sorts of problems?
Krzysztof
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