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

public member function

std::slice::start

Return start of slice

Returns the index of the first element in the valarray that the slice object selects.

Parameters none

Return value Index of the first element selected by the slice.
size_t is an unsigned integral type.

Example

// slice::start 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 (2,4,1);

  std::valarray<int> bar = foo[slc];

  std::cout << "slice starting at " << slc.start() << ":\n";
  for (std::size_t n=0; n<bar.size(); n++)
	  std::cout << bar[n] << ' ';
  std::cout << '\n';

  return 0;
}

Output:

slice starting at 2:
2 3 4 5