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Jonathan Müller @foonathan.fosstodon.org.ap.brid.gy · 06/08/2026

If and hos would you simplify this #cpp code? The code duplication is bugging me. ``` if constexpr (foo<T>) { obj.disableX(); } else if (bar(t)) { obj.disableX(); } else { obj.setX(t.x); } ``` You need an `if constexpr` for the first one, because if `foo<T>` is true, `.x` doesn't exist […]

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Jonathan Müller @foonathan.fosstodon.org.ap.brid.gy · 18/06/2026

Current status: rsync'ing .git folders to a remote machine. Because that's how version control works, right?

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Jonathan Müller @foonathan.fosstodon.org.ap.brid.gy · 26/05/2026

C++, the programming language where a hypothetical proposal titled "Make <meta> constexpr" would actually add support for runtime reflection.

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Jonathan Müller @foonathan.fosstodon.org.ap.brid.gy · 12/05/2026

"The problem is that the docs system is writing in Sphinx, and I don't know any Sphinx" - "Yeah, the people who set it up left." - "You mean, they were left in the pyramids after completion."

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Jonathan Müller @foonathan.fosstodon.org.ap.brid.gy · 11/05/2026

The state of tech 2026 is best amplified by "The company travel booking tool keeps randomly redirecting to Microsoft Copilot 365 because something in the SSO is broken."

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Jonathan Müller @foonathan.fosstodon.org.ap.brid.gy · 14/04/2026

Time since the last timezone bug: -2 hours.

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Jonathan Müller @foonathan.fosstodon.org.ap.brid.gy · 14/03/2026

Apparently, even though you are at an airport, your checked bags are somewhere on a conveyor belt at the airport, and you have a rebooked flight to your destination, there's nothing the baggage tracking office can do to ensure that your bag also makes it to the destination on that flight. You […]

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Jonathan Müller @foonathan.fosstodon.org.ap.brid.gy · 13/03/2026

The big three US airlines are United, Delta, and American. Missed opportunity for Delta to call itself States.

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Jonathan Müller @foonathan.fosstodon.org.ap.brid.gy · 11/03/2026

RE: mastodon.social/@Sdowney/1162102843… And I'll be talking about allternatives, contravariant functors, and lenses!

mastodon.social

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Niki @nikitonsky.mastodon.online.ap.brid.gy · 03/03/2026

Gotta give it to Claude Code developers: they are exceptionally brave. I would’ve been straight up embarrassed to show stats like this. Reminder: Claude Code is a thin CLI client that reads input from your terminal, sends it to Antrhopic servers and prints back the response.

Tweet by @trq212 about Claude Code rendering scene graph in 11 ms and printing it to terminal in 5 ms

Tweet by @jarredsumner about Claude Code memory usage growing from 10 Gb in January to 68 Gb to 1.7 Gb now

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Jonathan Müller @foonathan.fosstodon.org.ap.brid.gy · 19/12/2025

Reddit blog post discussing a problem. Commenter A: Can't you just do X? Commenter B:: No, because Y. Commenter A: But if you do X, then Z happens, so Y shouldn't be an issue. I didn't read the blog post. Commenter B: As the blog post explains, Z does not happen!

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Jonathan Müller @foonathan.fosstodon.org.ap.brid.gy · 08/11/2025

Achievement unlocked: if consteval { if constexpr (foo) { if (bar) { throw error; } } }

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dgelessus @dgelessus.mastodon.social.ap.brid.gy · 05/11/2025

when compiling C code, enable the -fPIE option to compile to Proto-Indo-European, for maximum compatibility with all CPU architectures developed on the Eurasian continent

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Jonathan Müller @foonathan.fosstodon.org.ap.brid.gy · 05/11/2025

From the standardization committee that brought you keywords such as `co_return`, `decltype`, and `reinterpret_cast`, now for your consideration: `trivially_relocatable_if_eligible` and `replacable_if_eligible`! C++ - you're gonna need a bigger column limit.

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Jonathan Müller @foonathan.fosstodon.org.ap.brid.gy · 22/10/2025

I'm hoping a cobus is enough like a bus in that it gets me to my destination.

Photo of a sign in a bus saying the name of the manufacturer/model:

cobus 3000

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Reposted by Jonathan Müller

Markus Werle @markuswerle.nrw.social.ap.brid.gy · 28/08/2025

As co-organizer of the C++ User Group #Aachen, I am thrilled to announce our program for next Wednesday, September 3, 2025. We will meet at SLB starting at 6:30 p.m., and the talks will begin at 7:00 p.m.. If possible, please pre-register at […] [Original post on nrw.social]

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Jonathan Müller @foonathan.fosstodon.org.ap.brid.gy · 21/08/2025

LLVM bitcode is not good designed if you want to generate it efficiently. For example, you need to define all types that a module is using without duplicates. This is easily done with a hash table and ideally you could use the binary serialization as key: Serialize into a buffer, do lookup in […]

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Jonathan Müller @foonathan.fosstodon.org.ap.brid.gy · 19/08/2025

Another day, another #if 0 ... #endif bisect to find the code that crashes MSVC.

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Jonathan Müller @foonathan.fosstodon.org.ap.brid.gy · 17/08/2025

Got tired of linking with LLVM so I've written something to emit bitcode directly. The blocks and records are conveniently defined in a little X macro file which then is used to stamp out a fully type safe builder API.

X Macro definition file:

//=== identification block ===//
LLVM_BC_DEFINE_BLOCK (IDENTIFICATION, 13)

LLVM_BC_DEFINE_RECORD (IDENTIFICATION, STRING, 1, (String, str))
LLVM_BC_DEFINE_RECORD (IDENTIFICATION, EPOCH, 2, (llvm_BcEpoch, epoch))

//=== module block ===//
LLVM_BC_DEFINE_BLOCK(MODULE, 8)

LLVM_BC_DEFINE_RECORD (MODULE, VERSION, 1, (llvm_BcModuleVersion, version))
LLVM_BC_DEFINE_RECORD (MODULE, SOURCE_FILENAME, 16, (String, name))

$Usage example of the API: auto identification = llvm_bc_block(IDENTIFICATION, ctx, memory.task); { llvm_bc_record( IDENTIFICATION_STRING, ctx, identification, memory.task, .str = zstring("my-producer") ); llvm_bc_record( IDENTIFICATION_EPOCH, ctx, identification, memory.task, .epoch = LLVM_BC_EPOCH ); } auto module = llvm_bc_block(MODULE, ctx, memory.task); { llvm_bc_record(MODULE_VERSION, ctx, module, memory.task, .version = LLVM_BC_MODULE_VERSION); llvm_bc_record(MODULE_SOURCE_FILENAME, ctx, module, memory.task, .name = zstring("input")); } llvm_bitcode(ctx, memory.task, identification, module, out);$

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Reposted by Jonathan Müller

maybeanerd @maybeanerd.bumscode.com.ap.brid.gy · 11/07/2025

Enjoyed the talk by @foonathan at #weAreDevelopers on how to do functional programming in C++ a lot I don't even use C++, but it was so well presented that I felt I still understood

Jonathan on stage answering questions from the aduience

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Jonathan Müller @foonathan.fosstodon.org.ap.brid.gy · 02/07/2025

Today I rebased my stuff after spending two weeks on conferences only to discover that we've introduced an `use_iter_move_on_xvalue_dereference_index` customization point.

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Jonathan Müller @foonathan.fosstodon.org.ap.brid.gy · 23/06/2025

Can anybody I know invite me to lobste.rs?

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Christian Lawson-Perfect @christianp.mathstodon.xyz.ap.brid.gy · 29/05/2025

When you finish writing your parser

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Jonathan Müller @foonathan.fosstodon.org.ap.brid.gy · 24/04/2025

I love how fixing audio issues on various linux devices has become as simple as `pacman -S pipewire-pulse` or `pacman -S pipewire-alsa`.

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Jonathan Müller @foonathan.fosstodon.org.ap.brid.gy · 24/04/2025

Next week, I'm going to be attending C++Now, and I'm going to be giving my two favorite talks of all time: First, a repeat of my "Overenginering max(a, b)" talk, which is just a bunch of fun metaprogramming to solve a safety problem. Then, a new talk "Missing (and future?) range concepts" […]

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Jonathan Müller @foonathan.fosstodon.org.ap.brid.gy · 09/03/2025

I've been programming in C for a small project, a couple of thoughts: * -Wimplicit-fallthrough isn't enabled by -Wall -Wextra in clang, which has bitten me. * I got tired of `Foo foo = (foo)x`, so I'm using C23 and auto, sorry, not sorry. * I spend a lot less time thinking about interface […]

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Jonathan Müller @foonathan.fosstodon.org.ap.brid.gy · 28/02/2025

I published my trip report about the Hagenberg meeting last week: www.think-cell.com/en/career/devblo… It was pointed out to me that I was wrong about the potential for dangerous optimizations with contracts and ODR. It is in fact […]

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Jonathan Müller @foonathan.fosstodon.org.ap.brid.gy · 24/01/2025

I'm going to be speaking at the C++ meetup in Helsinki on February 4th! Overengineering `max(a, b)`: Mixed Comparison Functions, Common References, and Rust's Lifetime Annotations www.meetup.com/cpphelsinki/events/3… #cpp #cplusplus

Meetup #10
Tuesday 4 February 2024 Maijansali, Oodi Helsinki Central Library Doors: 17:00 Talks start: 18:00
Sponsored by: think-cell

Main talk:Jonathan Müller “Overengineering max (a, b) Mixed comparison functions, X common references, and Rust's lifetime annotations”

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Jonathan Müller @foonathan.fosstodon.org.ap.brid.gy · 09/01/2025

FYI: "advertisement for other languages" isn't a valid reason to report a post on r/cpp.

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Jonathan Müller @foonathan.fosstodon.org.ap.brid.gy · 18/12/2024

Current status: Wishing the C preprocessor had lambdas to pass to a PP_FOR_EACH macro. Reflection can't get here soon enough.

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Jonathan Müller @foonathan.fosstodon.org.ap.brid.gy · 18/12/2024

I've found a cool idiom for tagged unions of aggregates: Give each aggregate member a tag defaulted to the correct kind. That way, when you use designated initializers to construct the object, it will be automatically initialized correctly. godbolt.org/z/MYE91hGY6 #cpp #cplusplus

Picture of the code from the godbolt link

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Jonathan Müller @foonathan.fosstodon.org.ap.brid.gy · 12/12/2024

Go is a programming language with a strange property: The more I learn about it over the years, the less I like it.

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Jonathan Müller @foonathan.fosstodon.org.ap.brid.gy · 10/12/2024

Days since the last clang stack overflow due to high nesting of range adaptors: 0

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Jonathan Müller @foonathan.fosstodon.org.ap.brid.gy · 05/12/2024

Company Christmas party, CEO is giving a retrospective of the year: "We have gained X new customers, closed Y tickets, and reported 25 compiler bugs!" Shoutout to MSVC, couldn't do it without you.

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Jonathan Müller @foonathan.fosstodon.org.ap.brid.gy · 02/12/2024

"profiles are very easy to sell. They reassure people who don’t care about safety that they don’t have to, and they reassure everyone else that there is a path forward. And we can blame users or implementers when it ultimately fails to have a meaningful impact" […]

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Jonathan Müller @foonathan.fosstodon.org.ap.brid.gy · 29/11/2024

We've got a new copy editor at work and he's great: > I expected this rejection: LEWG, the group responsible for designing the standard library, is historically not really sympathetic to people who don't want to use the standard library, but I am still disappointed.{{#Copy editor: That sucks […]

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