@ericniebler

C++ core compute libraries tech lead at @nvidia, father, @isocpp member, former nomad, and sometimes artist wannabe. Views are mine, not my employer's

 Seattle, WA
ericniebler.com
Joined September 2010
  • Tweets7K
  • Following137
  • Followers11.8K
740Media
Thread of tips about Generic Programming. xitter.cf/ericniebler/status/990…
@ericniebler.bsky.social@ericniebler29 Apr 2018
Generic Programming pro tip: Although Concepts are constraints on types, you don't find them by looking at the types in your system. You find them by studying the algorithms. #cpp
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Did grade school suck for you because you were a "problem child" (read: neurodivergent)? Yes? My partner @MERottsolk has created the school that we didn't have when we were kids, a place where different is normal. And they're fund raising. Click here: zeffy.com/en-US/fundraising/…

Double your gift! Anonymous donors matching up to $30,000 for Giving Tuesday!'s Fundraiser

In celebration of our official 501(c)3 status and upcoming Giving Tuesday, members of the Trillium community have generously offered a matching challenge to…

zeffy.com
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She overheard one student telling another over lunch: "This is the first time in my life that I feel safe." This place is saving lives. That's not an exaggeration.
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I hope @Kasparov63 comes to bsky.
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Let's play Does It Compileses, Precious? 𝚝𝚎𝚖𝚙𝚕𝚊𝚝𝚎 <𝚌𝚕𝚊𝚜𝚜 𝚃> 𝚜𝚝𝚛𝚞𝚌𝚝 𝚘𝚒𝚗𝚔 { 𝚜𝚝𝚊𝚝𝚒𝚌_𝚊𝚜𝚜𝚎𝚛𝚝(!𝚜𝚝𝚍::𝚒𝚜_𝚟𝚘𝚒𝚍<𝚃>); 𝚜𝚝𝚛𝚞𝚌𝚝 𝚋𝚘𝚒𝚗𝚔 { 𝚜𝚝𝚊𝚝𝚒𝚌_𝚊𝚜𝚜𝚎𝚛𝚝(𝚜𝚝𝚍::𝚒𝚜_𝚟𝚘𝚒𝚍<𝚃>); }; }; 𝚘𝚒𝚗𝚔<𝚒𝚗𝚝> 𝚖𝚎𝚘𝚠;
50%of course it compiles
50%nope, no way
391 votes • Final results
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Should be is_void_v, sorry.
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No spoilers!
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I found an implementation of `std::declval` that compiles 2x faster than the "standard" one[*]. Rather than overload resolution and SFINAE, this one uses a variable template and a partial specialization: [*]: tested w/ clang-17
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tagging some stdlib implementors: @CoderCasey @wakomeup @LouisDionne. Also, thanks to @LouisDionne for his wonderful metabench tool: github.com/ldionne/metabench

GitHub - ldionne/metabench: A simple framework for compile-time benchmarks

A simple framework for compile-time benchmarks. Contribute to ldionne/metabench development by creating an account on GitHub.

github.com
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... and this implementation is 3x faster than the standard `declval`, but it doesn't handle abominable function types correctly. <shakes fist>
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So where are the cool kids these days?
44%Mastadon
56%BlueSky
134 votes • Final results
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Given all the Things, it's time to listen to some Rage Against The Machine.
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What comes after "Write a simple sender"? This gist shows how to implement `just`, `then`, `when_all`, `run_loop`, `sync_wait` and more, and it doesn't leave out the cancellation bits. And it's only ~500 LOC. gist.github.com/ericniebler/…
@ericniebler.bsky.social@ericniebler27 Sep 2024
This remains my favorite tweet about senders.
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There is no such standard algorithm, is there?
a function that takes a count, a callable, and a pack of arguments, and that applies the arguments to the callable count times.

ALT a function that takes a count, a callable, and a pack of arguments, and that applies the arguments to the callable count times.

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WAIT WAIT this is totally wrong do not call `std::forward` of the same object more than once please forget you saw me post this and don't EVER do this in your code
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The out-of-memory daemon ... crashed?
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Every time I wrap `max` in parens, I curse the Windows team under my breath.
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Super interesting paper from @seanbax about memory-safety in C++ without lifetime annotations. I hope the C++ committee is receptive! attn: @isocpp open-std.org/jtc1/sc22/wg21/…
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Does anybody else find it mildly concerning that the EDG frontend has a file called "templates.cpp" that is 12,000 lines long? 😬
internal error: assertion failed at: "templates.cpp", line 11967 in find_template_variable

ALT internal error: assertion failed at: "templates.cpp", line 11967 in find_template_variable

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Y'all are acting like it's nothing for a single source file to be 10K+ LOC. Once a file is over 1K I have a hard time keeping track of what is where. Recursive decomposition -- breaking things up -- makes them more manageable. Modules, classes, functions ... and files too.
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"Senders Don't Send" by @benfrantzdale True, but "factory_for_an_immovable_thingy_you_can_start_and_that_will_complete_eventually" is an unwieldy name. reddit.com/r/cpp/comments/1f…

From the cpp community on Reddit: Sender Intuition: Senders Don't Send

Posted by BenFrantzDale - 33 votes and 17 comments

reddit.com
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