Python's context managers have that; define the two sides of the functionality in __enter__()/__exit__(), and voila. C#'s IDIsposable has this, too. So do oth

Python's context managers have that; define the two sides of the functionality in __enter__()/__exit__(), and voila. C#'s IDIsposable has this, too. So do other languages. It's really not that unusual a pattern.