[junon]

Honestly if this isn't part of a public API this isn't very cursed in terms of C++, especially if you have a lot of one-off cleanup operations.

I think the only bit I don't like personally is the syntax. I normally implement defer as a macro to keep things clean. If done correctly it can look like a keyword: `defer []{ something(); };`.

[quietbritishjim]

I think the syntax is exactly why they're saying it's cursed. IMO your suggestion is no better - yes it makes defer look like a keyword, but it's not! As I said in a sibling comment, I think it's clearer if you're honest that you're using a macro: DEFER([](){something();});

Or you could even make a non-macro version (but then you need to think of variable names for each defer):

   auto defer_uninitialise = do_defer([](){CoUninitialize();});

[junon]

Sure, I've used __LINE__ for this before too, and yeah I agree that my keyword construction was too clever (seemed cool at the time, since the macro had a dangling = at the end to make it work).