[Rcpp-devel] Picking off a matrix-valued list element inside a class constructor?

[Michael Hannon]

Thanks, Darren.  That worked well.

-- Mike



>________________________________
>From: Darren Cook <darren at dcook.org>
>To: rcpp-devel at r-forge.wu-wien.ac.at
>Sent: Sunday, October 23, 2011 1:20 AM
>Subject: Re: [Rcpp-devel] Picking off a matrix-valued list element inside a class constructor?
>
>>         Rcpp::IntegerMatrix m = l["m"];;
>> ...
>> This seems to work just fine.
>> ... the seemingly equivalent statement in the body of a class
>> constructor fails with a compilation error:
>> ...
>>     CCC(Rcpp::List l){
>>       m = l["m"];
>>     }
>
>
>In C++, the left side can sometimes give a hint about how the right-side
>should be interpreted. When I changed the constructor body to this it
>worked:
>   Rcpp::IntegerMatrix tmp=l["m"];
>   m = tmp;
>
>I tried a few ideas to get a one-liner that does the same... and
>couldn't; perhaps someone else knows the magic syntax?
>
>(For reference these were what I tried:
>   m =Rcpp::IntegerMatrix(l["m"]);
>   m =(Rcpp::IntegerMatrix)l["m"];
>   m.operator=<Rcpp::IntegerMatrix>(l["m"]);
>)
>
>>   [...]
>>   private:
>>     Rcpp::IntegerMatrix m;
>>   }   <-- NEED SEMI-COLON HERE
>>   '
>
>BTW, you are missing a semi-colon after the closing bracket for your class.
>
>Darren
>
>-- 
>Darren Cook, Software Researcher/Developer
>
>http://dcook.org/work/ (About me and my work)
>http://dcook.org/blogs.html (My blogs and articles)
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>
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