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Basically go to the current opencv docs :http://docs.opencv.org. Type in the function you currently have. If it has not yet been removed, than you will see a C++ implementation and a C implementation. The C implementations are the OpenCV1.x implementations, the C++ are the OpenCV2.x implementations.
Largest difference is the fact that C++ doesnt require you to destroy pointers, it is automated, reducing the amount of deleting to a minimum.
