return this.handle.ensureOpen();
    }

    /**
     * Gets the pipe handle implementation for this output stream.
     *
     * @return the handle
     */
    protected SmbPipeHandleImpl getHandle() {
        return this.handle;
    }

    @Override
    public void close() {
        // ignore, the shared file descriptor is closed by the pipe handle
    }

    }

    @Test
    @DisplayName("getHandle returns the exact handle instance")
    void getHandle_returnsHandle() throws Exception {
        // Arrange
        SmbPipeOutputStream out = newStream();

        // Act
        SmbPipeHandleImpl got = out.getHandle();

        // Assert
        assertSame(handle, got, "getHandle should expose the same instance passed to constructor");
    }

  TapeTensor(const TapeTensor& other);
  ~TapeTensor();

  int64_t GetID() const;
  tensorflow::DataType GetDType() const;

  AbstractTensorHandle* ZerosLike() const;

  AbstractTensorHandle* GetHandle() const;

 private:
  AbstractTensorHandle* handle_;
};

// A tracing/immediate-execution agnostic tape.
//
// Gradient functions defined for this tape must support handling null incoming