[Rcpp-devel] Problem with push_back to a list

[Michael Hannon]

[...]

> You were very, very close to this existing example from the unit test file
> runit.Vector.R (which, as Lists are GenericVector objects, also contains
> lists):
> 
>                   ,"list_push_back"=list(
>                   signature(x = "list"),
>                   'List list(x) ;
>                 list.push_back( 10 ) ;
>                 list.push_back( "bar", "foo" ) ;
>                 return list ;
>               ')
> 
> So with that it works if I write your example like this:
> 
> -----------------------------------------------------------------------------
> library(inline)
> 
> code <- '
>     Rcpp::List myList(rList);
>     myList.push_back(10);
>     myList.push_back("foo", "bar");
>     return myList;
> '
> 
> lfun <- cxxfunction(signature(rList = "list"),
>                     body    = code,
>                     plugin  = "Rcpp")
> -----------------------------------------------------------------------------
> 
> as can be seen below.
> 
> Do not underestimate the usefulness of 750+ regression tests in 330+
> functions that are run with every release.  They do provide examples, even if
> they are a little hard to read at first :)
> 
> Also, if an example does not compile, comment-out and simplify til it
> does. The templated code is finicky. I often split very complex expression
> into components as there is no shame in using temporary variables....

Great!  Thanks, Dirk.  I HAVE looked at the runit stuff before but didn't
think to do so in this case.

-- Mike
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