[ClaudeP]

I didnt know what this is called so I didnt know what to search in google. In this prototype the '&' address operator comes after the type Mat :

Mat& ScanImageAndReduceC(Mat& I, const uchar* table);

Can somone give me an explanation of what this is? I come from a Java background so Im just trying to learn this new magical syntax with C++. Thanks!

[Salem_c]

They're called "references" in C++.
Now you have a keyword to search with

[sepp2k]

In that context & isn't the address-of operator, it's part of the function's signature. It signifies that the function takes a reference to a Mat object and returns a reference to a Mat object (the same that a Mat* would denote a pointer to a Mat object).

For more information read up about references in C++.

[ClaudeP]

Thank you very much!