(hwisnu.bearblog.dev)

Show context

fuhsnn ◴[17 Nov 25 13:13 UTC] No.45953265[source]▶

> C23 gave us [[cleanup]] attributes

C23 didn't introduce it, it's still a GCC extension that needs to be spelled as [[gnu::cleanup()]] https://godbolt.org/z/Gsz9hs7TE

replies(1): >>45953601 #

1. cassepipe ◴[17 Nov 25 14:00 UTC] No.45953601[source]▶

>>45953265 #

It is surprisingly hard to find information about it, do you have any ? From what I can guess it's a new syntax but it's the feature itself is still an extension ?

replies(4): >>45953886 #>>45954031 #>>45954617 #>>45966700 #

2. SAI_Peregrinus ◴[17 Nov 25 14:31 UTC] No.45953886[source]▶

>>45953601 (TP) #

The `[[attribute]]` syntax is new, the builtin ones in C23 are `[[deprecated]]`, `[[fallthrough]]`, `[[maybe_unused]]`, `[[nodiscard]]`, `[[noreturn]]`, `[[reproducible]]`, and `[[unsequenced]]`.

3. ksherlock ◴[17 Nov 25 14:46 UTC] No.45954031[source]▶

>>45953601 (TP) #

[[ ]] attributes were added in C++11 and later C23. There are 7 standard(C32) attributes but GCC has hundreds of them.

https://en.cppreference.com/w/c/language/attributes.html

https://en.cppreference.com/w/cpp/language/attributes.html

https://gcc.gnu.org/onlinedocs/gcc/Attributes.html

https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attribute...

replies(1): >>45957206 #

4. kccqzy ◴[17 Nov 25 15:47 UTC] No.45954617[source]▶

>>45953601 (TP) #

The feature itself is probably still __attribute__((cleanup(f))). That’s documented at https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attribute...

5. fuhsnn ◴[17 Nov 25 19:29 UTC] No.45957206[source]▶