Hacker News: nemetroid

New comment by nemetroid in "Belgium stops decommissioning nuclear power plants"

nemetroid — Fri, 01 May 2026 11:29:45 +0000

The west, you mean?

New comment by nemetroid in "PL/0"

nemetroid — Wed, 25 Feb 2026 21:51:02 +0000

Using '=' for both assignment and comparison is awkward when parsing incomplete code. Consider e.g.:

  j = 5;

The user starts writing (<|> is the cursor position):

  i = <|>
  j = 5;

This is a valid expression (i is a boolean). But the user probably intends to finish writing something like:

  i = 0;
  j = 5;

So in the intermediate state we would like to emit a single warning about an incomplete statement. But since it is valid as written, we instead end up warning about e.g. j being unbound.

New comment by nemetroid in "Delta single handle ball faucets (1963)"

nemetroid — Mon, 26 Jan 2026 09:49:42 +0000

Not common for showers, though. Those almost always have separate temperature and flow controls.

New comment by nemetroid in "Design Thinking Books (2024)"

nemetroid — Thu, 22 Jan 2026 14:38:17 +0000

I read it and thought it contained several good ideas, but was excessively wordy and would have benefited from being half as long.

New comment by nemetroid in "Oh My Zsh adds bloat"

nemetroid — Sat, 10 Jan 2026 17:01:36 +0000

Why would I leave it open once I'm done with the task for which I opened the terminal?

New comment by nemetroid in "Rust--: Rust without the borrow checker"

nemetroid — Thu, 01 Jan 2026 19:27:26 +0000

Yes, many or even most domains where C++ sees a large market share are domains with no other serious alternative. But this is an indictment of C++ and not praise. What it tells us is that when there are other viable options, C++ is rarely chosen.

The number of such domains has gone down over time, and will probably continue to do so.

New comment by nemetroid in "C++ says “We have try... finally at home”"

nemetroid — Mon, 29 Dec 2025 12:06:44 +0000

You can throw in a destructor but not from one, as the quoted text rightly notes.

New comment by nemetroid in "Tieredsort: Header only, blazing fast (3-4x) C++17 sorting for numeric types"

nemetroid — Sat, 27 Dec 2025 16:49:30 +0000

Slop.

https://github.com/Cranot/tieredsort/blob/4091f66c31b4d2f8a1...

New comment by nemetroid in "What's New in Python 3.15"

nemetroid — Sun, 21 Dec 2025 13:09:47 +0000

The new profiling.sampling module looks very neat, but I don't see any way to enable/disable the profiler from code. This greatly limits the usefulness, as I am often in control of the code itself but not how it is launched.

New comment by nemetroid in "Getting bitten by Intel's poor naming schemes"

nemetroid — Fri, 19 Dec 2025 18:52:40 +0000

RHEL10 has been released and does require x86-64-v3.

https://access.redhat.com/solutions/7066628

New comment by nemetroid in "How well do you know C++ auto type deduction?"

nemetroid — Mon, 15 Dec 2025 15:58:33 +0000

Each entry in the map will be copied. In C++, const T& is allowed to bind to a temporary object (whose lifetime will be extended). So a new pair is implicitly constructed, and the reference binds to this object.

New comment by nemetroid in "How well do you know C++ auto type deduction?"

nemetroid — Mon, 15 Dec 2025 15:14:23 +0000

Close, it is a std::pair, but it differs in constness. Iterating a std::map yields std::pair, so you have:

  std::pair

  std::pair

New comment by nemetroid in "Sending DMARC reports is somewhat hazardous"

nemetroid — Wed, 03 Dec 2025 13:14:01 +0000

> Both Microsoft and Google seem to do it just fine

Microsoft sends me DMARC reports saying "yes, everything was accepted 100%, all good". The delivery logs on our end look good as well. However, they silently drop a large portion of messages with a Hotmail destination.

New comment by nemetroid in "We stopped roadmap work for a week and fixed bugs"

nemetroid — Mon, 24 Nov 2025 21:05:03 +0000

A nice way to fix bugs is to make the buggy state impossible to represent. In cases where a bug was caused by some fundamental flaw in the original design, a redesign might be the only way to feel reasonably confident about the fix.

New comment by nemetroid in "Inside Rust's std and parking_lot mutexes – who wins?"

nemetroid — Mon, 24 Nov 2025 20:29:20 +0000

You're right and I edited my comment.

New comment by nemetroid in "Inside Rust's std and parking_lot mutexes – who wins?"

nemetroid — Mon, 24 Nov 2025 19:53:02 +0000

> The effect of referring to a copy of the object when locking, unlocking, or destroying it is undefined.

https://pubs.opengroup.org/onlinepubs/9699919799/functions/V...

I.e., if I pthread_mutex_init(&some_addr, ...), I cannot then copy the bits from some_addr to some_other_addr and then pthread_mutex_lock(&some_other_addr). Hence not movable.

> Moving a mutex is otherwise non-sensical once the mutex is visible

What does "visible" mean here? In Rust, in any circumstance where a move is possible, there are no other references to that object, hence it is safe to move.

New comment by nemetroid in "Designing a Language (2017)"

nemetroid — Sat, 15 Nov 2025 13:17:58 +0000

PLEASE mention INTERCAL!

New comment by nemetroid in ""Our research is greatly sped up by AI but AI still needs us""

nemetroid — Sun, 09 Nov 2025 19:15:25 +0000

Did you read the essay?

New comment by nemetroid in "Text case changes the size of QR codes"

nemetroid — Fri, 07 Nov 2025 12:17:15 +0000

The article has an off-by-one error. There are 45 characters in the basic alphanumeric alphabet, and / is the missing one.

New comment by nemetroid in "The last European train that travels by sea"

nemetroid — Mon, 27 Oct 2025 12:39:08 +0000

The tracks on the Gothenburg side have since been removed, so even this workaround would not be possible today (they would have to go to Trelleborg instead).