Thread: dynamic array of struct within dynamic array of struct

Hey

Here's an example of how I've been allocating structs:

Code:

typedef struct outer {
  char n;
  inner *b;
} outer;

typedef struct inner {
  float foo;
  int bar;
} inner;

int i, j;
outer *A = malloc(sizeof(outer) * 100);
for(i = 0; i < 100; i++)
{
  A[i].b = malloc(sizeof(inner) * 1000);
}

and it seems to work ok. I was wondering what this would look like in memory though - I'm assuming that each inner *b array will be scattered. So my question is, does this reduce performance, and is it possible to allocate a single dynamic block for the whole outer *A structure?

Many thanks
Gib

Hey thanks for the reply. So that would create an inner memory block, is it possible to create an outer memory block?