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MatConstIterator (without any template brackets) defaults to MatConstIterator_<uchar>

so, that's the wrong type. try like:

Point2i pi(0,0);
Mat_<float> m(2,2);
m << 1.0f, 2.0f, 3.0f, 4.0f;

MatConstIterator_<float> ito(&m, pi);
cout <<(*ito) << endl;

in the end, maybe you should avoid writing code like this. anything "per-pixel" is slow and error prone.

MatConstIterator (without any template brackets) defaults to MatConstIterator_<uchar>

so, that's the wrong type. try like:

Point2i pi(0,0);
Mat_<float> m(2,2);
m << 1.0f, 2.0f, 3.0f, 4.0f;

MatConstIterator_<float> ito(&m, pi);
cout <<(*ito) << endl;

in the end, maybe you should avoid writing code like this. anything "per-pixel" is slow and error prone.

cout << int(value) << endl;