size_t size() const;
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// slice::size example
#include <iostream> // std::cout
#include <cstddef> // std::size_t
#include <valarray> // std::valarray, std::slice
int main ()
{
std::valarray<int> foo (10);
for (int i=0; i<10; ++i) foo[i]=i;
std::slice slc (0,3,1);
std::valarray<int> bar = foo[slc];
std::cout << "slice with a size of " << slc.size() << ":\n";
for (std::size_t n=0; n<bar.size(); n++)
std::cout << bar[n] << ' ';
std::cout << '\n';
return 0;
}slice with a size of 3: 0 1 2