I'm confused by the OpenCV Mat element types. This is from the docs:

There is a limited fixed set of primitive data types the library can operate on.
That is, array elements should have one of the following types:

8-bit unsigned integer (uchar) 
8-bit signed integer (schar)
16-bit unsigned integer (ushort)
16-bit signed integer (short)
32-bit signed integer (int)
32-bit floating-point number (float)
64-bit floating-point number (double)
...

For these basic types, the following enumeration is applied:
enum { CV_8U=0, CV_8S=1, CV_16U=2, CV_16S=3, CV_32S=4, CV_32F=5, CV_64F=6 };

It's known that C++ standard doesn't define the size of basic types in bytes, so how do they use such assumptions? And what type should I expect from, let's say, CV_32S, is it int32_t or int?

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