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Showing content from https://cplusplus.com/reference/valarray/slice/size/ below:

public member function

std::slice::size

Return size of slice

Returns the number of elements in the slice.

Parameters none

Return value Number of elements in the slice.
size_t is an unsigned integral type.

Example

// 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;
}

Output:

slice with a size of 3:
0 1 2