New C features in GCC 13 (Red Hat Developer)
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New C features in GCC 13 (Red Hat Developer)
The nullptr constant first appeared in C++11, described in proposal N2431 from 2007. Its purpose was to alleviate the problems with the definition of NULL, which can be defined in a variety of ways: (void *)0 (a pointer constant), 0 (an integer), and so on. This posed problems for overload resolution, generic programming, etc. While C doesn’t have function overloading, the protean definition of NULL still causes headaches.
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New C features in GCC 13 (Red Hat Developer)
Posted May 4, 2023 19:31 UTC (Thu) by bartoc (subscriber, #124262) [Link]
New C features in GCC 13 (Red Hat Developer)
Posted May 4, 2023 19:48 UTC (Thu) by kreijack (guest, #43513) [Link]
Another interesting thing that I hope to be standardized is the GCC[*] __attribute__((cleanup)) will be standardized (with a better syntax).
[*] However IIRC also clang has the same attribute.
New C features in GCC 13 (Red Hat Developer)
New C features in GCC 13 (Red Hat Developer)
Posted May 4, 2023 21:04 UTC (Thu) by mss (subscriber, #138799) [Link]
There actually is a proposal for a feature along the lines of __attribute__((cleanup))
Shame that the defer feature didn't make C23 - neither did its dependency of lambda functions.
While having lambda functions support in the language just save some typing when implementing callbacks, having the defer feature would allow implementing pseudo-RAII in a standard complaint way - so it would be an important improvement.
Without that standard support current implementations, like Glib's g_autoptr(), have to resort to per-compiler extensions like the aforementioned GCC's attribute.
In general, I think it's very good that, as the article says, these proposals align the C and C++ languages a little bit closer to each other by entwining certain features, and make programming in C easier and more secure.
New C features in GCC 13 (Red Hat Developer)
Posted May 5, 2023 4:09 UTC (Fri) by alison (subscriber, #63752) [Link]
CppCast Episode 297 had a great interview with JeanHeyd Meneide called "Defer is better than destructors" in which they wax eloquent on this topic. Meneide also says that defer and lambdas would make writing a C container library possible.
New C features in GCC 13 (Red Hat Developer)
Posted May 4, 2023 21:13 UTC (Thu) by atai (subscriber, #10977) [Link]
New C features in GCC 13 (Red Hat Developer)
Posted May 5, 2023 9:24 UTC (Fri) by ballombe (subscriber, #9523) [Link]
This will cause macros to produce unintended behavior.
It is way too late to make this kind of change to the language.
New C features in GCC 13 (Red Hat Developer)
Posted May 4, 2023 21:45 UTC (Thu) by ceplm (subscriber, #41334) [Link]
>
> enum F : int { A = 0x8000 } f;
>
> […] Thus a better variant would be to use one of the types defined in <stdint.h>, for example:
>
> enum F : int_least32_t { A = 0x8000 } f;
I am just a stupid Pythonista, but is there anybody really who would willingly routinely use types like “int_least32_t”?
Beautiful is better than ugly!
New C features in GCC 13 (Red Hat Developer)
Posted May 5, 2023 0:56 UTC (Fri) by branden (guest, #7029) [Link]
With a plain "int" you get an integer of whatever size the platform feels like providing. Is it a fast int? Is it a small int? Undefined.
New C features in GCC 13 (Red Hat Developer)
Posted May 5, 2023 6:56 UTC (Fri) by mb (subscriber, #50428) [Link]
And the fast/least types are BS. Sprinkling the code with ugly fast-types doesn't make it any faster. It just increases the likelihood of subtle bugs due to actual type size differences between platforms.
Just use fixed types like uint32_t.
New C features in GCC 13 (Red Hat Developer)
Posted May 5, 2023 9:35 UTC (Fri) by ballombe (subscriber, #9523) [Link]
New C features in GCC 13 (Red Hat Developer)
Posted May 5, 2023 10:03 UTC (Fri) by adobriyan (subscriber, #30858) [Link]
New C features in GCC 13 (Red Hat Developer)
Posted May 5, 2023 10:05 UTC (Fri) by hkario (subscriber, #94864) [Link]
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