c++ - Delete a pointer to pointer (as array of arrays) -

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i have in code: 

double** desc = new double* [size_out]; (int = 0; < size_out; i++)     desc[i] = new double [size_in];

how delete desc?

should do:

delete [] desc;

or

for (int i=0; i<size_out; i++)     delete [] desc[i]; delete [] desc;

or

for (int i=0; i<size_out; i++)     delete [] desc[i]; delete desc;

?

simple rules follow:

  • for each allocation, there has deallocation (ex1 therefore wrong)
  • what allocated using new should freed using delete, using new[] should deallocated using delete[] , using malloc should deallocated using free (ex3 therefore wrong)

conclusion, ex2 ok.


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