> void testing(void)
> {
> #define NR_STRUCT_A (4)
> struct B* ptr = malloc(sizeof(struct B) + NR_STRUCT_A*sizeof(struct
> A));
>
> ptr->numelem = NR_STRUCT_A;
> ptr->item = (struct A*)(ptr+1);
>
> ptr->item[0].a = 0;
> ptr->item[1].a = 1;
> ptr->item[2].a = 2;
> ptr->item[3].a = 3;
> ptr->item[4].a = 100; /* Wrong, violate memory accessing here! */
> #undef NR_STRUCT_A }
IMO, this is a viable alternative. The only disadvantage is that it is taking an extra sizeof(struct A *) bytes of memory, if memory space is a concern.
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