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by going through this link I got some information , and tested it. I am working on opencv v3.4.2 in Ubuntu 18.04.

If I am using cv::Point_<<uchar>uchar> Pixel, its giving me a wrong output, but if uchar Pixel is being used the error is given at the compilation time only.

In member function 'void Operator::operator()(Pixel&, const int*) const': for_each.cpp:23:78: error: request for member 'x' in 'pixel', which is of non-class type 'Pixel {aka unsigned char}' rmat("[%d,%d]= %d \n",position[0],position[1],(uchar)pixel.x);

code

    #include <opencv2/opencv.hpp>
#include <stdio.h>
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include <iostream>

using namespace std;
using namespace cv;
using std::cout;




typedef cv::Point_<uchar> Pixel;//wrong
//typedef uchar Pixel;  //  correct
//typedef Point3_<uint8_t> Pixel;



struct Operator {
    void operator ()(Pixel &pixel, const int * position) const 
    {           
        cout << format("[%d,%d]= %d \n",position[0],position[1],(uchar)pixel.x);      
    }
};

int main( int argc, char* argv[])
{    
    Mat mTest(Size(3, 2), CV_8UC1,Scalar(0));   
    randn(mTest,Scalar(125),Scalar(125));
    cout<<"I am using ----> cv::Point_<uchar> Pixel  \n";
    //cout<<"I am using ----> uchar Pixel \n";
    cout<< format (" Size : %d , %d \n\n",mTest.rows,mTest.cols);

//for(;;)
 {
    for (int Rows = 0; Rows < mTest.rows; Rows++)
    {
        for (int Cols = 0; Cols < mTest.cols; Cols++)
        {
            cout << format("[%d,%d]= %d \t",Rows,Cols,mTest.at<uchar>(Rows,Cols));
        }
        cout << "\n";
    }

    cout << "\n\n";
  }

//for(;;)
    mTest.forEach<Pixel>(Operator());

    waitKey();
    return 0;
}

Is the problem with the new opencv version ?? And can it be resolved??

by going through this link I got some information , and tested it. I am working on opencv v3.4.2 in Ubuntu 18.04.

If I am using cv::Point_<<uchar>uchar> cv::Point_<uchar> Pixel, its giving me a wrong output, but if uchar Pixel is being used the error is given at the compilation time only.

In member function 'void Operator::operator()(Pixel&, const int*) const': for_each.cpp:23:78: error: request for member 'x' in 'pixel', which is of non-class type 'Pixel {aka unsigned char}' rmat("[%d,%d]= %d \n",position[0],position[1],(uchar)pixel.x);

code

    #include <opencv2/opencv.hpp>
#include <stdio.h>
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include <iostream>

using namespace std;
using namespace cv;
using std::cout;




typedef cv::Point_<uchar> Pixel;//wrong
//typedef uchar Pixel;  //  correct
//typedef Point3_<uint8_t> Pixel;



struct Operator {
    void operator ()(Pixel &pixel, const int * position) const 
    {           
        cout << format("[%d,%d]= %d \n",position[0],position[1],(uchar)pixel.x);      
    }
};

int main( int argc, char* argv[])
{    
    Mat mTest(Size(3, 2), CV_8UC1,Scalar(0));   
    randn(mTest,Scalar(125),Scalar(125));
    cout<<"I am using ----> cv::Point_<uchar> Pixel  \n";
    //cout<<"I am using ----> uchar Pixel \n";
    cout<< format (" Size : %d , %d \n\n",mTest.rows,mTest.cols);

//for(;;)
 {
    for (int Rows = 0; Rows < mTest.rows; Rows++)
    {
        for (int Cols = 0; Cols < mTest.cols; Cols++)
        {
            cout << format("[%d,%d]= %d \t",Rows,Cols,mTest.at<uchar>(Rows,Cols));
        }
        cout << "\n";
    }

    cout << "\n\n";
  }

//for(;;)
    mTest.forEach<Pixel>(Operator());

    waitKey();
    return 0;
}

Is the problem with the new opencv version ?? And can it be resolved??