Use MAT-File direct access in C++ API

Dear all,

I always use matfile() function to store large arrays on the fly directly to the file, without bumping in to memory. I am doing some C++ staff with matOpen() with "w7.3" argument. However, I do not know how to perform the same file direct access feature in C++.

For instance, instead of

for (int i = 0; i < TOP; i++)
  result[i] = someFunc();
storeResult(result);

I would like to store the results directly during

result[i] = someFunc();

Does anyone know how to do it?

Thanks for your time.