Le 14/08/13 16:25, Dirk Eddelbuettel a écrit :
On 14 August 2013 at 15:57, Matteo Fasiolo wrote:
| thank you very much for your replies. In the end a named vector is
| enough for my purpose:
|
| cppFunction(
| '
| NumericVector myVett(NumericVector x = NumericVector::create(0) )
| {
| if(x.size() == 0) x = NumericVector::create(_["a"] = 1.0, _["b"] = 2.0);
| return x;
| }
| '
| )
You don't even need the assignment in the function definition:
R> cppFunction("NumericVector matteo(NumericVector x) { if (x.size()==0) x =
NumericVector(4); return(x); }")
R> matteo(vector())
[1] 0 0 0 0
R> matteo(1:3)
[1] 1 2 3
R>
Dirk
This might not stay valid code when we put more control for dispatch,
argument recognition etc.
Some of that is in place with Rcpp::is, the rest will follow. We might
lose things like this, but we will gain more useful things instead.
And we never said passing 0 arguments to a function needing one works,
so it is not a documented feature.
Romain
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