Method allocate

cpp/src/arrow/stl_allocator.h:74–79

  const_pointer address(const_reference r) const noexcept { return std::addressof(r); }

  pointer allocate(size_type n, const void* /*hint*/ = NULLPTR) {
    uint8_t* data;
    Status s = pool_->Allocate(n * sizeof(T), &data);
    if (!s.ok()) throw BadAlloc(std::move(s));
    return reinterpret_cast<pointer>(data);
  }

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