Creating an array of Mats of size n

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I am trying to create an array of Mat objects to store images and am getting warnings for using anything other than a statically typed number such as 10

int numberOfRects = boundRect.size();
Mat image_array[numberOfRects];

When I try this code I get an error stating Variable length array of non-POD element type 'cv::Mat'

Same goes for this code: Mat image_array[boundRect.size()];

How can I create an array of Mats based on the size of boundRect?