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[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 488: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 488: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
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InsideQC Forums • View topic - Funny C Rules (And Low-Level Languages in general)

Funny C Rules (And Low-Level Languages in general)

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Funny C Rules (And Low-Level Languages in general)

Postby Baker » Thu Feb 26, 2015 9:15 pm

Last edited by Baker on Fri Feb 27, 2015 12:07 am, edited 9 times in total.
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Re: Funny C Rules (And Low-Level Languages in general)

Postby jitspoe » Thu Feb 26, 2015 9:57 pm

The "string" "combination" stuff is super useful:

A lame example, but:

#define GAME_NAME "MyTestGame"

const char *welcome_string = "Hello, and welcome to " GAME_NAME "! Enjoy your stay!"

If you have a string like this that frequently changes and is used all over (ex version/build ID), it can be a real time saver.

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Re: Funny C Rules (And Low-Level Languages in general)

Postby Baker » Thu Feb 26, 2015 10:19 pm

I find the lack of preprocessor capabilities to do some light string manipulation a limitation, personally. To anything other than very light string concatenation is non-existent. With the stringify macro operators you can do some fairly interesting things, but the preprocessor directives required to pull it off end up being rather difficult to read :(
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Re: Funny C Rules (And Low-Level Languages in general)

Postby mankrip » Thu Feb 26, 2015 11:38 pm

I used the second one for all quit messages, as in "Blahblah.\n\n\
Blah?"
. They became much easier to read in the code.

I didn't know about the sizeof one. Nice find!
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Re: Funny C Rules (And Low-Level Languages in general)

Postby Baker » Thu Feb 26, 2015 11:48 pm

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Re: Funny C Rules (And Low-Level Languages in general)

Postby jitspoe » Fri Feb 27, 2015 1:35 am


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Re: Funny C Rules (And Low-Level Languages in general)

Postby Baker » Fri Feb 27, 2015 1:58 am

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Re: Funny C Rules (And Low-Level Languages in general)

Postby mh » Fri Feb 27, 2015 11:17 am

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Re: Funny C Rules (And Low-Level Languages in general)

Postby Baker » Fri Feb 27, 2015 2:42 pm

That's crazy!
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Re: Funny C Rules (And Low-Level Languages in general)

Postby Baker » Fri Feb 27, 2015 9:31 pm

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Re: Funny C Rules (And Low-Level Languages in general)

Postby Baker » Sat Feb 28, 2015 2:10 am

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Re: Funny C Rules (And Low-Level Languages in general)

Postby mh » Sat Feb 28, 2015 1:41 pm

Assignment in any sane world should always go right-to-left. The C assignment operator, strcpy, memcpy - all go right-to-left. Quake's VectorCopy (and other Vector* macros) have tripped me up more than once. :evil:
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Re: Funny C Rules (And Low-Level Languages in general)

Postby Baker » Sat Feb 28, 2015 5:47 pm

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Re: Funny C Rules (And Low-Level Languages in general)

Postby Baker » Sat Feb 28, 2015 10:19 pm

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Re: Funny C Rules (And Low-Level Languages in general)

Postby ericw » Sat Feb 28, 2015 10:40 pm

Yeah the
dest->foo = src->foo;
VectorCopy(src->pos, dest->pos);
thing is awful. Using "const" liberally could detect mixing up the order of VectorCopy, but usually in Quake both source and dest are mutable.

IMO the 0=success, 1=failure, or -1=less, 0=same, 1=greater stuff is horrible legacy style, but often you have to have no choice because you're using API's that use that. The right way is C++11's "enum class" which don't implicitly convert to int.
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