Method Date,double>

inst/include/Rcpp/date_datetime/Date.h:143–145

    // needed to wrap containers of Date such as vector<Date> or map<string,Date>
    namespace internal {
        template<> inline double caster<Rcpp::Date,double>(Rcpp::Date from) {
            return static_cast<double>(from.getDate());
        }
        template<> inline Rcpp::Date caster<double,Rcpp::Date>(double from) {
            return Rcpp::Date(static_cast<int>(from));
        }