More on const arguments:
the first will compile and work, the second will not compile, even if we
do not modify anything. As far as I can tell, in this case the culprit is
related to having the reference to the Column, because f3 does compile and
work.
I guess the problem is the "*this", returned by Column; is there another
way of making sure the caller does not modify the matrix, while enjoying
the usage of Column (and Row)?
Best,
R.
// [[Rcpp::export]]
int f1(Rcpp::IntegerMatrix m1) {
const Rcpp::IntegerMatrix::Column c1 = m1(_, 1);
int dd = c1[0] * 2;
return dd;
}
// [[Rcpp::export]]
int f2(const Rcpp::IntegerMatrix m1) {
const Rcpp::IntegerMatrix::Column c1 = m1(_, 1);
int dd = c1[0] * 2;
return dd;
}
// [[Rcpp::export]]
int f3(const Rcpp::IntegerMatrix m1) {
int dd = m1(0, 0) * 2;
return dd;
}
--
Ramon Diaz-Uriarte
Department of Biochemistry, Lab B-25
Facultad de Medicina
Universidad Autónoma de Madrid
Arzobispo Morcillo, 4
28029 Madrid
Spain
Phone: +34-91-497-2412
Email: [email protected]
[email protected]
http://ligarto.org/rdiaz
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