Question: how to get 16 byte aligned address using ZoneHeap?

[mouhgh96]

Hi,
i'm try to build a simple memory allocator(as an assignment poject) and i found Heap layers very interesting
using Allocator = FreelistHeap<ZoneHeap<SizedMmapHeap, 1024 * 8>>;
when defining my allocator as shown above i don't get 16 byte aligned address
after reading the source code i have found :

class Arena {
  public:
    Arena() {
      static_assert((sizeof(Arena) % MallocInfo::Alignment == 0),
              "Alignment must match Arena size.");
    }

    Arena * nextArena;
    char * arenaSpace;
    size_t arenaSize;
  };

as Arena is never instantiated explicitly the static_assert fail silently i don't know if it's intentional, in my case i added a dummy
pointer to solve the problem (is there a better solution or am i using heap layer the wrong way)
thanks