Strong opinions, (bi-)weekly held - with great guests from the C++ community

Each fortnight, or thereabouts, we chat with guests from the C++ community about what they're doing, what interests them, and what's going on in the world of C++.

Hosted by Jon Kalb and Phil Nash.

Please send questions to We're also on Twitter as @cppchat

auto latest = episode<63> {
.title = "All the C++30 Features - but Right Now", /*

This week, in a exclusive, we chat with Sean Baxter about Circle - the C++ compiler that he wrote. That’s a C++ compiler. That he wrote. Oh, and it does meta-programming in a way that we’re only dreaming of part of for C++23 or 26!

So what can it do, and what is it useful for? Why is Jon struggling to wrap his head around what Sean has achieved and can it really turn Twitter into code?

If you want to follow along screen shared segment, I've tried to embed screenshots in the podcast mp3 - or you can go to this point in the YouTube recording.

And finally, contrary to what Phil says during the show, there were not 130 lightning talks at CppCon. It was more like 70 - and we're not including a link to the ACCU CfP as it has now closed).

.links = { "Main site for Circle", "Circle repo", /* includes the examples discussed and many others */ "F# style Type Providers in Circle", /* Written the day after the show was recorded */ "C++ on Sea Call for Speakers" },
.tags = { "metafor", "meta", "c++30", "c++23", "c++20", "circle", "c++" } };

With: Sean Baxter
Recorded: 3 October 2019
Released: 6 November 2019
59 mins 53 secs

A YouTube stream archive of this recording is also available:

< previous episode
Previous episodes:

episode<62> { "I’m Surprised You Brought up Rotate", { "Sean Parent" } "17 October 2019" };
episode<61> { "You Get to Fix It the next Time", { "Andrei Alexandrescu", "Herb Sutter" } "12 October 2019" };
episode<60> { "The Shape of the Value", { "David Sankel", "Michael Park" } "28 September 2019" };
episode<59> { "There's No Secret to Security. The Secret Is ...", { "Patricia Aas" } "12 September 2019" };

// ...
// for the complete list of previous episodes, see the Episodes page.