How do I call a context objects destructor or some type of exit() function automatically upon exiting a with {} scope?

[Mike Parker]

On Tuesday, 1 April 2025 at 16:54:50 UTC, Daniel Donnelly, Jr. 
wrote:
> I thought the destructor might automatically be called after 
> with (new Context()) {} but it's not.  Is there some sort of 
> entry/exit functions like in Python?

You've used `new`, which means it's allocated with the GC. In 
that case, your destructor is a finalizer and may or may not be 
called at any point during the program. It's non-deterministic.

If `Context` is a class, you can do this:

```
scope ctx = new Context;
```

This will allocate the class instance on the stack so the 
destructor will be called when the scope exits. And of course, if 
it's a struct, then just drop the new.

All of that said, D does have scope guards when you need them:

https://dlang.org/spec/statement.html#scope-guard-statement