ITK  4.13.0
Insight Segmentation and Registration Toolkit
WikiExamples/Images/Index.cxx
#include "itkIndex.h"
int main(int, char *[])
{
// Method 1 - set both index[0] and index[1] to the same value (in this case, 0).
index.Fill(0);
std::cout << index << std::endl;
// Method 2 - set each component of the index individually.
index[0] = 1;
index[1] = 2;
std::cout << index << std::endl;
return EXIT_SUCCESS;
}