Method NewOrCopy

napi-inl.h:3201–7207

template <typename T>
template <typename Finalizer, typename Hint>
inline Buffer<T> Buffer<T>::NewOrCopy(napi_env env,
                                      T* data,
                                      size_t length,
                                      Finalizer finalizeCallback,
                                      Hint* finalizeHint) {
  details::FinalizeData<T, Finalizer, Hint>* finalizeData =
      new details::FinalizeData<T, Finalizer, Hint>(
          {std::move(finalizeCallback), finalizeHint});
#ifndef NODE_API_NO_EXTERNAL_BUFFERS_ALLOWED
  napi_value value;
  napi_status status = napi_create_external_buffer(
      env,
      length * sizeof(T),
      data,
      details::FinalizeData<T, Finalizer, Hint>::WrapperWithHint,
      finalizeData,
      &value);
  if (status == details::napi_no_external_buffers_allowed) {
#endif
    // If we can't create an external buffer, we'll just copy the data.
    Buffer<T> ret = Buffer<T>::Copy(env, data, length);
    details::FinalizeData<T, Finalizer, Hint>::WrapperGCWithHint(
        env, data, finalizeData);
    return ret;
#ifndef NODE_API_NO_EXTERNAL_BUFFERS_ALLOWED
  }
  if (status != napi_ok) {
    delete finalizeData;
    NAPI_THROW_IF_FAILED(env, status, Buffer());
  }
  return Buffer(env, value);
#endif
}

template <typename T>
inline Buffer<T> Buffer<T>::Copy(napi_env env, const T* data, size_t length) {
  napi_value value;
  napi_status status =
      napi_create_buffer_copy(env, length * sizeof(T), data, nullptr, &value);
  NAPI_THROW_IF_FAILED(env, status, Buffer<T>());
  return Buffer<T>(env, value);
}

template <typename T>
inline void Buffer<T>::CheckCast(napi_env env, napi_value value) {
  NAPI_CHECK(value != nullptr, "Buffer::CheckCast", "empty value");

  bool result;
  napi_status status = napi_is_buffer(env, value, &result);
  NAPI_CHECK(status == napi_ok, "Buffer::CheckCast", "napi_is_buffer failed");
  NAPI_CHECK(result, "Buffer::CheckCast", "value is not buffer");
}

template <typename T>
inline Buffer<T>::Buffer() : Uint8Array() {}

template <typename T>
inline Buffer<T>::Buffer(napi_env env, napi_value value)