WikiExamples/Images/Size.cxx

#include "itkSize.h"

int main(int, char *[])
{
  itk::Size<2> size;
  // You will often get this type from an image type. That is, ImageType::SizeType rather than itk::Size<2> explicitly.

  // Method 1 - set both components (size[0] and size[1]) to the same value (in this case, 0).
  size.Fill(0);
  std::cout << size << std::endl;

  // Method 2 - set each component separately.
  size[0] = 1;
  size[1] = 2;

  std::cout << size << std::endl;

  return EXIT_SUCCESS;
}