How to resize/append to a matlab::data:StructArray using the MATLAB C++ API

I am implementing a function as a mex file in C++. In order to export internal data to MATLAB, I'm using the createStructArray function to preallocate a StructArray with n elements as below:

auto x = factory.createStructArray({ 1, n}, {"field1", "field2", "field3"});

I can then populate the fields of x something like this:

for (auto ii = 0; ii < n; ++ii) {
    x[ii]["field1"] = factory.createScalar<double>(...);
    x[ii]["field2"] = factory.createScalar<double>(...);
    ...
}

All good so far, however on a subsequent iteration of the function, I want to be able to append new data to an existing StructArray, which would require resizing the existing StructArray to, say, {1, n+n1}. Indexing outside of the preallocated range within MATLAB would automatically force a resize, however that doesn't work here. There doesn't appear to be any resize() or related functions in the API.

Is there a good way of resizing/appending new data to an existing StructArray that doesn't involve simply copying all of the existing elements to a new StructArray?

Answer 1

[Ted]

I believe there is no such convenience. As you said at the end of your question, you will have to make a new larger array and copy the existing elements over.