CODEWITHSUNDEEP
c++opencv
Ansu
Ansu

Reputation: 123

what happens when we overwrite cv::Mat.data

What will happen when we manually add an address of a buffer in data attributes of a cv::Mat object, and later delete that buffer?

For example,

cv::Mat test;
test.data = (address of Buffer A);

what will happen to test.data when Buffer A is deleted?

Upvotes: 1

Views: 762

Answers (1)

Tony J
Tony J

Reputation: 651

Documentation: http://docs.opencv.org/3.1.0/d3/d63/classcv_1_1Mat.html

int rows, cols, type; // you need initialize them
void* data = (address of Buffer A)
cv::Mat test = cv::Mat(rows, cols, type, data); // according to documentation, test does not own data
cv::Mat copy = test.clone() // copy copies is a deep copy of test

So since test does not own Buffer A, once it's delete, if you access test.data, it's UB. However, since copy is a deep copy, you can access copy.data

Upvotes: 2

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