warning: unused parameter size_i and size_j

[kivadiu]

This program:

#include <boost/numeric/ublas/functional.hpp>
int main() {
  return 0;
}

when compiled on linux x86_64 with clang++ 5.0.2 and boost 1.68.0 beta1 with the following command:
clang++ -o ublas.o -c -DNDEBUG -Wall -Wextra -std=c++14 -I/softs/lin64-clang-5.0.2/release/boost/include ublas.cpp
gives the following warnings:

In file included from ublas.cpp:1:
/softs/lin64-clang-5.0.2/release/boost/include/boost/numeric/ublas/functional.hpp:1673:57: warning: unused parameter 'size_i' [-Wunused-parameter]
        size_type upper_element (size_type i, size_type size_i, size_type j, size_type size_j) {
                                                        ^
/softs/lin64-clang-5.0.2/release/boost/include/boost/numeric/ublas/functional.hpp:1673:88: warning: unused parameter 'size_j' [-Wunused-parameter]
        size_type upper_element (size_type i, size_type size_i, size_type j, size_type size_j) {
                                                                                       ^
2 warnings generated.