std::gslice

// gslice example
#include <iostream>     // std::cout
#include <cstddef>      // std::size_t
#include <valarray>     // std::valarray, std::gslice
int main ()
{
  std::valarray<int> foo (14);
  for (int i=0; i<14; ++i) foo[i]=i;
  std::size_t start=1;
  std::size_t lengths[]= {2,3};
  std::size_t strides[]= {7,2};
  std::gslice mygslice (start,
                        std::valarray<std::size_t>(lengths,2),
                        std::valarray<std::size_t>(strides,2));
  std::valarray<int> bar = foo[mygslice];
  std::cout << "gslice:";
  for (std::size_t n=0; n<bar.size(); n++)
	  std::cout << ' ' << bar[n];
  std::cout << '\n';
  return 0;
}