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#include <cstddef>

void* my_malloc(std::size_t nbytes) {
  void *ptr;
  // allocate storage from own pool and set ptr
  return ptr;
}

void* my_calloc(std::size_t nelems, std::size_t elsize) {
  void *ptr;
  /// allocate storage from own pool and set ptr
  return ptr;
}

void* my_realloc(void *ptr, std::size_t nbytes) {
  // reallocate storage from own pool and set ptr
  return ptr;
}

void my_free(void *ptr) {
  // return storage to own pool
}