Question

I have a structure that has an array.

struct Page_Directory {
public:
    int numEntries;
    int nextDirPage;
    int [] array;
};

However, I always want this array to be of certain length, so that the size of this structure is always 4 + 4 + 100*4 bytes.

I don’t want to have a structure declaration like following:

struct Page_Directory {
public:
    int numEntries;
    int nextDirPage;
    int *array;
};

since size of this structure is 4 + 4 + 4 = 12 bytes (even if I allocate memory to entries by using new or malloc).

Now, how do I achieve this? I can’t put a declaration like the first one in header file, you don’t put array size details in the header file, only what each member’s type.

Answer 1

If you always want the array to have a certain size then there is no way around
declaring it with a certain size:

struct Page_Directory {
public:
    int numEntries;
    int nextDirPage;
    int array[100];
};