Question

I need to allocate a very large array is there a way to allocate an array without this types of errors? note that I have 8 GB of memory without using vector
this is exactly the error

Unhandled exception at 0x771515ee in __ Microsoft C++ exception:
 std::bad_alloc at memory location 0x0049f904.. 

and this is a chunk of my code

#include<cstdlib>
int main()
{
  size_t arraySize =1024*1024*1024;
  int *a= new int[arraySize];
  for (int i = 0; i < arraySize; i++)
  {
    a[i] = 3;
  } 
  return 0; 
}

/* Thanks guys the solution for my problem is to create a new solution platform with x64 bit operation*/

Answer 1

You are trying to allocate a 4GB block in a 32 bit process. That’s not possible. You are limited to somewhere between 2GB and 4GB addressable space, but in reality much less will be available in a single contiguous block.

If you really need such a large block in a single array then you’ll want to switch to a 64 bit process. Reconsidering your algorithm is likely to be the best solution.