Method deallocate

example/cpp11/allocation/server.cpp:64–76

  }

  void deallocate(void* ptr)
  {
    auto* ucptr = static_cast<unsigned char*>(ptr);
    if (std::less_equal<unsigned char*>{}(storage_, ucptr)
        && std::less<unsigned char*>{}(ucptr, storage_ + preallocated_))
    {
      // Nothing to do.
    }
    else
    {
      ::operator delete(ptr);
    }
  }

private:
  std::size_t preallocated_;