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advanced (lemmy.world)
submitted 3 months ago by hairinmybellybutt to c/[email protected]
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[-] SpaceNoodle 24 points 3 months ago

Damn, you beat me to it.

It's common enough that it's supported like a comment by numerous syntax highlighting schemes, and has the added benefits of guaranteeing that the code won't be compiled as well as encapsulating any pre-existing block comments. Conversely, if (false) is total garbage.

[-] Duralf 13 points 3 months ago

If (false) is good because it is compiled so it doesn't get stale.

[-] AlmightySnoo 6 points 3 months ago* (last edited 3 months ago)

A simple if (false) will get optimized out by any modern C or C++ compiler with optimizations on, but the problem is that the compiler will still parse and spend time on what's inside the if-block and it has to be legal code, whereas with the #if 0 trick the whole thing gets yeeted away by the preprocessor before even the compiler gets to look at it regardless of whether that block contains errors or not, it's literally just a string manipulation.

[-] Duralf 10 points 3 months ago

I think you missed the whole point of my comment ๐Ÿ˜‚. Regardless, the time spent compiling a small snippet of code is completely negligible. In the end, both #if 0 and if (false) have their complimentary uses.

[-] AlmightySnoo -1 points 3 months ago

Yeah, but I still think if (false) is silly because it adds an artificial constraint which is to make sure the disabled parts always compile even when you're not using them. The equivalent of that would be having to check that all the revisions of a single source file compile against your current codebase.

[-] [email protected] 3 points 3 months ago

If(false) works in interpreted languages, the other one doesn't. It's stupid either way, that's what version control is for, but if we are doing the stupidness anyway, you can't use preprocessor flags in many languages because shit doesn't get compiled.

[-] AceBonobo 5 points 3 months ago

"you're not wrong, you're just an asshole"

[-] Duralf 1 points 3 months ago

Fair enough, I do love being contrarian

[-] pelya 2 points 3 months ago

Tell this to my -Wall -Werror

this post was submitted on 21 Nov 2023
423 points (97.1% liked)

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