How to get return of list of mwArray?

I have a class Batch which contains 4 members as following (in C++):

 class Batch
 {
  public:
  float MaxLen = -1;
  float** Word;
  float* Delete;
 };

I have to call Matlab DLL which will return a list of these Batch, prepared as following:

function [Batches] = GetBatches(...)
    for i = 1:N_batch
        current_batch = Batch();
        current_batch.MaxLen = f(...);
        ...
        Batches{i} = current_batch;
    end
end

How do I get the return value (list of batches) in this situation. I am aware that if i need to get a single batch, then I need to have sent an mwArray of Batch class as following:

const char* batchFieldNames[] = {"MaxLen","Word","Delete"};
mwArray TestBatchMW(1, 1, sizeof(batchFieldNames) / sizeof(batchFieldNames[0]), batchFieldNames);
GetTestBatch(1, TestBatchMW, TestMW)