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diff --git a/doc/c23.md b/doc/c23.md new file mode 100644 index 0000000..d91a40f --- /dev/null +++ b/doc/c23.md @@ -0,0 +1,36 @@ +# C23 status + +cproc implements some C23 features applied to the latest drafts. + +## [N2265]: `_Static_assert` without message + +C11 required that static assertions always contained a message. C23 +now allows `_Static_assert` with just an expression. + +## [N2418]: UTF-8 character constants + +C23 introduces UTF-8 character constants using the syntax `u8'a'`. +Compared to an unprefixed character constant, they have type `unsigned +char` instead of `int`, and are guaranteed to use UTF-8 encoding +rather than the execution character set. Since the character in a +UTF-8 character constant must have a single-byte UTF-8 encoding, +this type of character constant could be useful when you need the +ASCII value of a character, but do not want to depend on any +particular execution character set. + +## [N2508]: Free positioning of labels inside compound statements + +In previous revisions of C, labels like `foo:`, `case 123:`, or +`default:` could only precede statements. This was relaxed in C23, +and they can now appear intermixed with declarations in compound +statements. + +## [N2549]: Binary integer constants + +C23 allows binary integer constants in addition to octal, decimal, +and hexadecimal, using syntax like `0b01101011`. + +[N2265]: http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2265.pdf +[N2418]: http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2418.pdf +[N2508]: http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2508.pdf +[N2549]: http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2549.pdf |