Viewing profile — StephanTLavavej

Yep, that's my pull request. :-) At the moment, it's usable if you build the microsoft/STL repo with VS 2022 17.4 Preview 3 or later. When VS 2022 17.5 Preview 1 ships (in the very…

Note that the O-rings were 12 feet in diameter - they encircled the entire solid rocket booster. They definitely didn't cost less than a dollar.

I'm glad you liked my charconv talk! Here's a complete list of my recorded conference talks: BoostCon/C++Now 2012: Regex In C++11 And Boost: https://youtu.be/mUZL-PRWMeg GoingNativ…

std::format is available, with all C++20 Defect Reports implemented, in VS 2019 16.11.14 (and all later 16.11.x) and VS 2022 17.2 (and all later 17.x).

It’s actually inverse cube for magnets - see https://en.wikipedia.org/wiki/Force_between_magnets : “One characteristic of a dipole field is that the strength of the field falls off…

Here’s what we do in MSVC’s STL: constexpr bool test_is_even() { assert(is_even(0)); assert(!is_even(1)); // … more test coverage return true; } int main() { test_is_even(); // run…

> I'm curious if anybody is working to make C++ faster to compile. Yes - C++20 added support for modules to the Core Language (both "header units" and "named modules"; header units…

Can you expand on how Roll breaks down when the players are trying to win?

Thank you!

I opened the spreadsheet, and now I can't remove it from my list of Google Sheets (unlike most shared spreadsheets). Am I missing some obscure way to remove it, despite the Remove …

MSVC has /O1 and /O2 (and /Os), but not /O3. See https://docs.microsoft.com/en-us/cpp/build/reference/compile... . (I work on MSVC's STL.)

Modern processors have integrated “firmware” TPMs, so you shouldn’t need a discrete module. See https://arstechnica.com/gadgets/2021/06/heres-what-youll-nee... for some details. I …

Well beyond exploring - microsoft/STL runs libc++’s test suite for every PR, skipping a set of known failures (for product bugs, test bugs, etc.), see https://github.com/microsoft/…

On the "How Was It Typed" page, Note 6 and beyond are using the same image, and link to an " http://xxxx " placeholder. Different images appear to have been intended (e.g. a Roman …

https://www.planetary.org/articles/08190630-curiosity-wheel-... explains the root cause.

That “weirdness” is just scientific notation, which the Ryu implementation always emits. It is “superficial” in the sense that it’s separate from the core algorithm. When I adapted…

We actually do use libc++'s test suite, which has found several bugs, but not this one (apparently because they don't yet have std::boyer_moore_searcher).

> you're guaranteed to have some bugs when implementing BM. Writing your own string search function seems nearly on the same level as implementing your own cryptographic functions,…

Very interesting, thanks!

Indeed, the randomized test in this PR uses alphabets from AB to ABCDEF, because I noticed the same thing - small alphabets make repetitions more likely, which are the tricky cases…

Apparently there are multiple fixes, some of which are said to be simpler. See https://github.com/microsoft/STL/issues/727 and the cited comments within, which quote Knuth. (I'm le…

I conclude that usage of std::boyer_moore_searcher is relatively low, despite this C++17 feature shipping in VS 2017 15.3 (August 2017). "www" triggers the bug like all 3-character…

This sounds like the vector >> fiasco, where a vector contains elements that are movable-only (you can't copy a list >, only move it), yet with throwing move constructors (as MSVC'…

I believe that fuzz testing would have found it, yes. I'm not sure if fuzz testing would have been guided towards highly repetitive patterns, given the relative lack of branches in…

After comparing the outputs of the old and new algorithms, I believe that a needle needs more than two repeats in order to trigger the bug. That is, "aa" and "abab" don't trigger t…