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foonathan.fosstodon.org.ap.brid.gy
Jonathan Müller
@foonathan.fosstodon.org.ap.brid.gy
70 followers 0 following 37 posts
C++, compilers, and programming languages. Library developer @ think-cell, chair for std::ranges @ C++ standardization committee.

[bridged from https://fosstodon.org/@foonathan on the fediverse by https://fed.brid.gy/ ]
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foonathan.fosstodon.org.ap.brid.gy
@vitaut Feels like -0°.
Screenshot of a weather app, the temperature is 4° but it feels like -0°.
November 19, 2025 at 11:47 AM
foonathan.fosstodon.org.ap.brid.gy
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
October 22, 2025 at 11:05 AM
foonathan.fosstodon.org.ap.brid.gy
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);
August 17, 2025 at 8:20 AM
foonathan.fosstodon.org.ap.brid.gy
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

https://www.meetup.com/cpphelsinki/events/305683323/?eventOrigin=group_upcoming_events

#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”
January 24, 2025 at 9:27 AM
foonathan.fosstodon.org.ap.brid.gy
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.

https://godbolt.org/z/MYE91hGY6

#cpp #cplusplus
Picture of the code from the godbolt link
December 18, 2024 at 5:23 PM