#include <iostream>

#include <opencv2/core/core.hpp>

#include <opencv2/highgui.hpp>

using namespace std;

using namespace cv;

typedef cv::Mat_<cv::Vec3b> Image;

struct Segmentation

{

    Image img;

};

struct Segmentation2

{

    Segmentation2( const Image & img ) : _img( img ) {}

    Image image() { return _img; }

private:

    Image _img;

};

int main( int argc, char ** argv )

{

    Image img = imread( argv[1] );

    Segmentation  s1 {img};

    Segmentation2 s2( img );

    cout << "This will work." << endl;

    for ( auto lit = s1.img.begin() ; lit != s1.img.end(); lit++ ) {}

    cout << "This will work as well." << endl;

    for ( auto i : s2.image() ) {}

    cout << "This will not work!" << endl;

    for ( auto lit2 = s2.image().begin(); lit2 != s2.image().end(); lit2++ ) {}

    cout << "This will not work!" << endl;

    for ( auto lit3 = begin( s2.image() ); lit3 != end( s2.image() ); lit3++ ) {}

    return 0;

}