System information (version)

• OpenCV => 4.5,2-pre
• Operating System / Platform => Windows 64 Bit
• Compiler => mingw64 (8.1.0)

Detailed description

Mat::ptr() overloads 9,10,19,20 are documented, predeclared, but not defined.

Steps to reproduce

Mat_<int> m(3,4); m << 1,2,3,4,5,6,7,8,9,10,11,12;
int i = m.ptr(Vec2i(1,1)); // expected: 6

resulting in:

C:\Users\admin\AppData\Local\Temp\ccz92Cq8.o:_demo.cpp:(.text.startup+0x2f2): undefined reference to `unsigned char* cv::Mat::ptr<2>(cv::Vec<int, 2> const&)'
collect2.exe: error: ld returned 1 exit status

interestingly, Mat::at(Vec<int,n>) is implemented like this:

it should be easy to implement the missing definitions in the same way

Issue submission checklist

• I report the issue, it's not a question
• I checked the problem with documentation, FAQ, open issues,
  forum.opencv.org, Stack Overflow, etc and have not found solution
• I updated to latest OpenCV version and the issue is still there
• There is reproducer code and related data files: videos, images, onnx, etc