On 14 May 2011 at 17:13, Chris DuBois wrote:
| Thanks Dirk. Quick newbie followup question: Can we put functions within the
| inline C++ code? The following doesn't compile, for example:
| src <- '
| int addition (int a, int b)
| {
| int r;
| r=a+b;
| return (r);
| }
| NumericVector xx(x);
| return(xx);
| '
| testfun = cxxfunction(signature(x="numeric"),body=src,plugin="Rcpp")
Use the 'verbose=TRUE' to cxxfunction() and it will become clear
why -- a function is written around the 'body=...' argument,
hence no chance that that part may contain another C++ function.
The remedy is simple: use the "include=..." argument as in
inc <- '
int addition (int a, int b) {
int r = a + b;
return (r);
}
'
src = '
NumericVector xx(x);
return(xx);
'
testfun = cxxfunction(signature(x="numeric"), body=src, include=inc,
plugin="Rcpp")
That trick is used a couple of time in the documentation and examples.
| On a related note, would you mind showing a quick working example using
| std::accumulate? The one below from the quick reference doesn't compile for
| me.
Try Google for something like that, eg a query that is restricted to my site as
in
site:dirk.eddelbuettel.com "std::accumulate"
show five immediate hits. You can similarly constrict the search
to the rcpp-devel list.
Can you send a small example for inline that shows how/where it quickref
example fails for you?
Dirk
--
Gauss once played himself in a zero-sum game and won $50.
-- #11 at http://www.gaussfacts.com
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