Rcpp check if list has an element -

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my program deals clustering. apart dataset user has specify details concerning clusters. there 2 ways approach that: specify number of clusters or prepare list of clusters' descriptions.

args <- list(dataset=points, k=5) args <- list(dataset=points, clusters=list(                              list(type="spherical",radius=4),                              list(type="covariance",covmat=matrix)                                           )

next call proper function (my program) in r args argument.

classification <- cec(args)

i prepare cec below

sexp cec(sexp args) {   rcpp::list list(args);   arma::mat dataset = rcpp::as<arma::mat>(list["dataset"]);   if(list.contains("k")) {     //something   } else if(list.contains("clusters")) {     //something   } }

i cannot find api list or example how that. moreover, study headers of rcpp definition of list typedef vector<vecsxp> list ; hardly helpful.

is there can use instead of list.contains() ?

you looking containselementnamed method: 

rcpp::list list(args); if( list.containselementnamed("k") ){     // } else {     // else }

https://github.com/rcppcore/rcpp/blob/master/inst/include/rcpp/vector/vector.h#l503


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