所有的OpenCV函数都抛出异常吗？

Question

OpenCV throws exceptions when hitting critical errors , however, in the documentation it is rarely (dare I say never) mentioned whether a particular function throws. See for instance the documentation on the watershed algorithm

I would like to catch errors close to where they occur and, for instance, wrap the call to watershed in a try-catch. But the documentation does not state whether the function throws, so wrapping it in try-catch may be a false security.

Can I assume that all OpenCV functions throws exceptions?

Answer 1

Can I assume that all OpenCV functions throws exceptions?

For the most part, yes. Many OpenCV methods will most likely perform a CV_ASSERT which will call cvError . In turn, cv::error will log, and throw exception.

But the documentation does not state whether the function throws, so wrapping it in try-catch may be a false security.

My rule-of-thumb is that if the method returns void , and the method is manipulative and/or acts on a resource, then it's wise to wrap in a try-catch. When in doubt, I'll evaluate the source code of the method to see what the assertions are checking for.