2-Dimensional array deallocation

Question

As an intro, I\'m using C++ in Visual Studio 2010, compiling for x64. I have a program that\'s using 2-Dimensional arrays to store data for running through a C style functio

Answer 1

You could use below as a macro or some delete function for 2D array with row count predefined :

for_each(results, results + rows , [](int* row) { delete[] row; });
delete[] results;

Answer 2

Your code crashes because you are passing an address of an address to delete[], which is not what you allocated. Change your code to this:

for (int i = 0; i < rows ; ++i){
    delete [] results[i];
    delete [] data[i];
}

It will no longer crash.

The rule on this is simple: since you assigned the results of new[..] to results[i], you should be passing results[i], not &results[i], to delete []. Same goes for data.

Also note that this code deletes all rows that you allocated, including the last one (the loop condition is now i < n, not i < n-1). Thanks bjhend!