Method deallocate

cpp/src/arrow/stl_allocator.h:81–83

  }

  void deallocate(pointer p, size_type n) {
    pool_->Free(reinterpret_cast<uint8_t*>(p), n * sizeof(T));
  }

  size_type size_max() const noexcept { return size_type(-1) / sizeof(T); }