Hacker News: mjs01

New comment by mjs01 in "C constructs that still don't work in C++"

mjs01 — Mon, 25 May 2026 04:42:52 +0000

Some unmentioned incompatibilities I've encountered that makes a C header not directly usable in C++:

- C `_Atomic(T)` and C++ `std::atomic`. C++23 has C compatible header `stdatomic.h` that defines `_Atomic(T)`, but it's still problematic

- C `_Noreturn/noreturn` and C++ `[[noreturn]]`. C23 `[[noreturn]]` makes them compatible

- C inline and C++ inline are different. Good news is their `static inline` are the same

- C has anonymous struct. C++ doesn't. Both have anonymous union though

New comment by mjs01 in "Everything in C is undefined behavior"

mjs01 — Wed, 20 May 2026 09:02:59 +0000

Integer promotion seems to be the source of many signed integer overflow UB. Why does C have it? Does integer promotion ever have a good part?

New comment by mjs01 in "It is incorrect to "normalize" // in HTTP URL paths"

mjs01 — Sat, 18 Apr 2026 08:13:30 +0000

// is useful if the server needs to serve both static files in the filesystem, and embedded files like a webpage. // can be used for embedded files' URL because they will never conflict with filesystem paths.