SIGN IN SIGN UP

improvement: fix issue 1968 and correct visitor pattern code and test. (#2023)

* fix issue 1968 and correct visitor pattern code and test.

* fix README code as well.
X
xyllq999 committed
a568656036a135492bfe35ba767b77e52e9d3019
Parent: b33d002
Committed by GitHub <noreply@github.com> on 9/25/2022, 6:02:08 PM