/usr/lib/R/site-library/dplyr/include/dplyr/visitor_set/VisitorSetHash.h is in r-cran-dplyr 0.7.4-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 | #ifndef dplyr_VisitorSetHash_H
#define dplyr_VisitorSetHash_H
#include <tools/hash.h>
namespace dplyr {
template <typename Class>
class VisitorSetHash {
public:
size_t hash(int j) const {
const Class& obj = static_cast<const Class&>(*this);
int n = obj.size();
if (n == 0) {
stop("Need at least one column for `hash()`");
}
size_t seed = obj.get(0)->hash(j);
for (int k = 1; k < n; k++) {
boost::hash_combine(seed, obj.get(k)->hash(j));
}
return seed;
}
};
}
#endif
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