Right around this time five years ago, I was playing a ton of Gabriele Cirulli’s HTML5 game “2048” — a game so popular that it has had its own Wikipedia page since ten days after its release (or, fourteen days after the first commit in Cirulli’s GitHub repo). “2048” spawned a ton of variants; I got particularly hooked on Baiqiang’s “Advanced 2048,” which added “x2” and “x4” tiles.

My lovely wife (who was at that time my lovely girlfriend) also got hooked on “2048” and “Advanced 2048”… but we were both a little disappointed by how the “x2” and “x4” tiles made it easier to get high scores. One day she said something like, “You should make one that has square root tiles, too.” So I cloned Gabriele Cirulli’s repo, merged in Baiqiang’s “x2” and “x4” tiles (more or less), and then added square roots. The result was aesthetically pleasing to both of us. You can play “√2048” here. …

This is an update of my previous post “How to build LLVM from source” (2018-04-16), which is now out-of-date. LLVM has moved to a “monorepo” design instead of a collection of smaller tool-specific repositories. So this new post has fewer steps!

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Here’s how to build a “Hello world” program using Clang’s implementation of C++2a Modules, as it currently stands as of November 2019. The compiler driver interface described here is practically guaranteed to change over the next couple of years, but this seems to be how it works right now in trunk.

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Twice in the past week I’ve run into this issue (once on CodeReview and once on Slack), so I thought I’d make a blog post about it.

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Previously on this blog: “Discrete Peaceful Encampments” (2019-01-24).

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I’ve been watching a lot of CppCon talks on YouTube over the past couple of weeks. I heard they’re going online at the rate of about seven per day.

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Today I failed to refactor a piece of code. Simplified:

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Recently, in a discussion of the Networking TS on one of WG21’s internal “reflector” mailing lists, Bjarne Stroustrup wrote:

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The other day on Slack, I learned a new acronym for my C++ acronym glossary: “VTT.” Godbolt:

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Back in September 2017, on libc++ review D37538, Eric Fiselier showed me the following piece of code.

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Herb Sutter’s closing keynote from CppCon 2019, “De-fragmenting C++,” is now up on YouTube. Here are some thoughts I had while watching it live:

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In Chandler Carruth’s CppCon 2019 talk “There Are No Zero-Cost Abstractions,” he talked a lot (not exclusively, but a lot) about the hidden performance cost of std::unique_ptr. See, unique_ptr may be the same size as a native pointer, but because it has a user-defined destructor, it is “non-trivial for purposes of ABI,” and that means it has to get passed on the stack.

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Well, that’s a wrap! CppCon 2019 is pretty much over for me; I’ve done my pre-conference weekend class and my four “Back to Basics” talks and my one non-B2B talk (based on this blog post from February)… and also the perhaps-inaugural “C++ Pub Quiz.”

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Seen on the whiteboard outside the Aurora D conference room at CppCon 2019:

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Tomorrow I’ll be flying out to Denver, Colorado, for CppCon 2019. This will be my busiest CppCon yet! Besides giving my “STL From Scratch” weekend course for the third year in a row, this year I’m also the chair of CppCon’s new “Back to Basics” track.

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The other day I was pondering a potential new exercise for my “STL from Scratch” class: write an iterator_facade similar to Boost’s, but as a mixin rather than a CRTP base class. I’ll skip the details, but the point is that I ended up thinking about how Boost’s old friend class iterator_core_access; idiom would translate into a world full of SFINAE.

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Ira Levin’s 1967 novel Rosemary’s Baby features the fictional book All Of Them Witches, by J.R. Hanslet. Roman Polanski’s 1968 film adaptation shows the book on-screen — a prop with surprisingly well-curated dummy text. I like freeze-framing text from movies, so, here’s my transcription and close reading of All Of Them Witches.

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I like this Code Golf question on “Church booleans.” A “Church boolean” is either of the following two functions (in C++17 syntax):

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The other day on Slack, someone posted a minimal unique_ptr and asked for code review. Its move-assignment operator looked something like this:

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The post-meeting mailing from WG21’s Cologne meeting was released just the other day. I wasn’t in Cologne, but the post-meeting mailing contains a couple of my contributions.

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