In C++/mex file, will the changes in memory in C be automatically reflected in Matlab

Hello, I am kind of new to the mex functions. If I use the mxGetData to get the pointer to the array and I change the value in the memory of that array, do I still need to make a copy of values using some mxfunctions and return it to matlab？ Or I need to do nothing and the value in Matlab will automatically change?

In other words, if we pass values to cpp using mxFunctions, do they do a shadow copy or a deep copy?

To make the question clear, here is an example C code:

 float * temp_data = (float*) mxGetData(prhs[0]);//at this time, temp_data[0] = 0

 temp_data[0] = 1;

If I don't do anything to return the temp_data, will the value in matlab be changed?

Thank you.

[Adam]

I'm afraid I don't know the answer off-hand, though I assume if you already have your mex program setup you could verify one way or the other in a few seconds yourself?