#include <stdint.h>

struct Arena {
  void *root_freespace;
  void *root_treealloc;
  void *(*get_new_region)(uintptr_t);
  void (*error)(char*);
};

void unalloc(struct Arena *arena, void *addr);
void *alloc(struct Arena *arena, uintptr_t size, uintptr_t align);