Thread

1. 112233 · 1790522632 · focus · HN ↗

   "This article was originally published in Polish in issue 4/2013" — a lot of excellent advice. Sad to see C++ have moved in last decade in a direction that makes writing efficient, simple low level code harder and harder :(

   1. jandrewrogers · 1790529234 · focus · HN ↗

      Writing clear, concise, and efficient code in C++ has never been simpler or easier. The improvements in C++ over the last 15 years have been qualitative.

      So many complex, esoteric, and difficult to maintain incantations that used to be required for efficient code generation are no longer necessary.

      1. 112233 · 1790536276 · focus · HN ↗

         How do you process read-only mmaped data in C++, in accordance with the language rules? As an example.

         1. senderista · 1790539674 · focus · HN ↗

            I think there are lots of Unix APIs that are impossible to use without UB, e.g. SCM_RIGHTS (maybe io_uring as well?).

            1. someonebaggy · 1790580791 · focus · HN ↗

               Implementations are free to define UB.

               1. Maxatar · 1790624733 · focus · HN ↗

                  UNIX APIs are not implementations.

                  1. someonebaggy · 1790632920 · focus · HN ↗

                     You compile programs for Unix using language implementations.

                     1. Maxatar · 1790640719 · focus · HN ↗

                        C++ implementations don't make any sort of special or unique accommodations for UNIX/POSIX APIs. For the most part calls into external libraries are firewalled and not optimized in a way that typically engenders undefined behavior, so POSIX APIs tend to work. But any external library would also work since it's not like POSIX is exclusively shielded or singled out in any particular way.

                        1. someonebaggy · 1790706186 · focus · HN ↗

                           If a compiler for Linux time travels whenever you use SCM_RIGHTS, take it back for a refund - it's faulty.

                           1. Maxatar · 1790710079 · focus · HN ↗

                              You can try to request a refund for free software but the terms of the compiler explicitly state that undefined behavior is permitted to "time travel" and that there's nothing faulty about it. That's C++ for you ;P

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