So maybe in C,

c Syntax (Toggle Plain Text)

struct vector_of_int {
  int   *data;
  size_t allocatedSize;
  size_t maxUsedSize;
};

struct vector_of_int { int *data; size_t allocatedSize; size_t maxUsedSize; };

Now create a bunch of access functions which take a vector_of_int as one of the parameters, and make it do things like
- allocate space
- extend space
- free space
- save an int
- return an int