ITK  4.9.0
Insight Segmentation and Registration Toolkit
WikiExamples/Images/Size.cxx
#include "itkSize.h"
int main(int, char *[])
{
// 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;
}