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</div> </div> </header> </div> <div id="content-wrapper" class="content-wrapper"> <div id="content" class="site-content"> <div id="primary" class="content-area"> <main id="main" class="site-main" role="main"> <header class="page-header"> <h1 class="page-title">Month: <span>September 2018</span></h1> </header> <article id="post-3685" class="post-3685 post type-post status-publish format-standard hentry category-c"> <header class="entry-header"> <h1 class="entry-title"><a href="https://herbsutter.com/2018/09/30/my-cppcon-2018-talk-is-now-online/" rel="bookmark">My CppCon 2018 talk is now online</a></h1> </header> <div class="entry-content"> <p><a href="https://www.youtube.com/watch?v=80BZxujhY38">My Thursday talk is now online.</a> Thanks to Mark Bashian and his wonderful team at <a href="http://www.bashfilms.com/">Bash Films</a> for posting the plenary sessions so quickly… it was great to see each keynote posted the following morning, and the rest of the CppCon 2018 videos will be posted in the next few weeks as usual.</p> <p>Thanks again to everyone who came! It was a great conference, and we are already looking forward to next year’s CppCon in our new location in Denver, CO, USA.</p> </div> <footer class="entry-footer"> <div class="entry-meta"> <span class="byline"> <a href="https://herbsutter.com/author/herbsutter/" title="Posts by Herb Sutter" rel="author">Herb Sutter</a> </span> <span class="cat-links"> <a href="https://herbsutter.com/category/c/" rel="category tag">C++</a> </span> <span class="comments-link"><a href="https://herbsutter.com/2018/09/30/my-cppcon-2018-talk-is-now-online/#comments">4 Comments</a></span> <span class="published-on"> <a href="https://herbsutter.com/2018/09/30/my-cppcon-2018-talk-is-now-online/" rel="bookmark"><time class="entry-date published updated" datetime="2018-09-30T09:09:36-08:00">2018-09-30</time></a> </span> <span class="word-count">1 Minute</span> </div> </footer> </article> <article id="post-3683" class="post-3683 post type-post status-publish format-standard hentry category-c"> <header class="entry-header"> <h1 class="entry-title"><a href="https://herbsutter.com/2018/09/20/lifetime-profile-v1-0-posted/" rel="bookmark">Lifetime profile v1.0 posted</a></h1> </header> <div class="entry-content"> <p>I love C++. I also love safe code and not having to worry about dangling pointers and iterators and views. So I’ve been doing some work to make my life less conflicted: As long promised, the <strong><a href="https://github.com/isocpp/CppCoreGuidelines/blob/master/docs/Lifetime.pdf">Lifetime profile 1.0 paper</a></strong> is now posted in the C++ Core Guidelines repo. It aims to detect common local cases of dangling pointers/iterators/string_views/spans/etc. in C++ code, at compile time, efficiently enough to run during normal compilation and in IDE tooltips. And, best of all (IMO), leveraging the rich information that’s already in typical modern C++ code, especially code that uses RAII and STL, with little or no annotation (e.g., see section 2.6).</p> <p>For a quick summary, section 1.1 is a readable 3-page overview. Or, if you prefer watching a talk video, you can also see <a href="https://www.youtube.com/watch?v=hEx5DNLWGgA&feature=youtu.be&t=29m6s">my CppCon 2015 talk starting at 29:06</a>, where I first talked about this work; the approach is still the same. I’ll also be <a href="https://herbsutter.com/2018/09/14/my-cppcon-2018-talk-title-and-abstract/">giving an update on this work next week at CppCon</a> as one of the three major sections of my talk this year.</p> <p>Many thanks to all of the people who contributed and gave feedback to help me flesh out this design over the past three years. I would like to especially thank <strong>Neil MacIntosh</strong> and <strong>Kyle Reed</strong> who did the bulk of the MSVC static analysis extension implementation work, and <strong>Matthias Gehre</strong> and <strong>Gábor Horváth</strong> who did the Clang-based implementation. Thank you! Those of you who’ll be at CppCon will see some of these folks on-stage showing their work in my talk, and be able to ask them questions at the conference.</p> <p>… Did I say Clang? Yes, there’s now also a Clang-based implementation in addition to MSVC. Although I stress this work is still somewhat experimental and that both are partial implementations, both of them do already compile most of the examples in the paper and both already run efficiently enough to run during normal compilation (Clang) and in the IDE for live-squiggle diagnostics (MSVC) even though they have not been optimized yet. And, as you’d expect in 2018, the Clang-based implementation is available on Godbolt — in the paper, just search for “godbolt” to find over 30 links to live examples. Here are a few you might find interesting:</p> <ul> <li><a href="https://godbolt.org/z/szJjnH">godbolt.org/z/szJjnH</a> A simple starter dangling raw pointer example.</li> <li><a href="https://godbolt.org/z/_midIP">godbolt.org/z/_midIP</a> This one’s simple but fun… quick, how is the pointer use on line 11 invalidated by the <em>following</em> line, line 12?</li> <li><a href="https://godbolt.org/z/dymV_C">godbolt.org/z/dymV_C</a> From C++17: A dangling <em>string_view</em>, which is important because it turns out to be easy to convert a <em>std::string</em> to a <em>string_view</em>, so that dangling is almost the default behavior.</li> <li><a href="https://godbolt.org/z/eqCRLx">godbolt.org/z/eqCRLx</a> From the very latest bleeding edge: A dangling <em>filter_view</em> from the Ranges TS that we’re about to see if we can merge into the standard in time for C++20. Those are non-owning indirections, so they can dangle too.</li> <li><a href="https://godbolt.org/z/iq5Qja">godbolt.org/z/iq5Qja</a> From C++98 with a dash of C++11: You know how using <em>auto</em> to deduce a <em>vector<bool></em> subscript <em>[]</em> operator actually captures a <em>vector<bool>::reference</em> proxy, which can dangle after a <em>push_back</em> or <em>reserve</em>? If you didn’t: Sorry to be the bearer of sad tidings, but here’s some good news about that example.</li> <li><a href="https://godbolt.org/z/UE-Mb0">godbolt.org/z/UE-Mb0</a> This short example can take a few minutes to grok… take a cup of coffee to understand who owns what and points where, and why the pointers are dangling (or not), and what the compiler is understanding about our code in order to be able to tell us about the problems accurately.</li> </ul> <p>If you’re interested in preventing common cases of dangling pointers, iterators, string_views, spans, and more, efficiently at compile time with high quality diagnostics, check out the examples in the paper and play around with them on Godbolt.</p> <p>If you find new examples that are correctly diagnosed that you think are particularly cool, feel free to distill them down to their essence (and sanitize them if they came from real code) and post them as new Godbolt links in the comments below — bonus points if you also briefly summarize what the problem is, and extra bonus points if they did come from real world code. I may add some of them to the paper, with attribution, and maybe even use one in next week’s talk.</p> </div> <footer class="entry-footer"> <div class="entry-meta"> <span class="byline"> <a href="https://herbsutter.com/author/herbsutter/" title="Posts by Herb Sutter" rel="author">Herb Sutter</a> </span> <span class="cat-links"> <a href="https://herbsutter.com/category/c/" rel="category tag">C++</a> </span> <span class="comments-link"><a href="https://herbsutter.com/2018/09/20/lifetime-profile-v1-0-posted/#comments">10 Comments</a></span> <span class="published-on"> <a href="https://herbsutter.com/2018/09/20/lifetime-profile-v1-0-posted/" rel="bookmark"><time class="entry-date published updated" datetime="2018-09-20T22:00:06-08:00">2018-09-20</time></a> </span> <span class="word-count">3 Minutes</span> </div> </footer> </article> <article id="post-3680" class="post-3680 post type-post status-publish format-standard hentry category-c"> <header class="entry-header"> <h1 class="entry-title"><a href="https://herbsutter.com/2018/09/14/my-cppcon-2018-talk-title-and-abstract/" rel="bookmark">My CppCon 2018 talk title and abstract</a></h1> </header> <div class="entry-content"> <p>In just 10 days, we’ll be at <a href="http://www.cppcon.org">CppCon</a>! I can hardly wait for Bjarne’s new opening keynote and the 100+ other sessions… we have a really great lineup of speakers again this year.</p> <p>I’ll be giving a talk as well, and here’s the title and abstract for what I’ll be covering this year. I hope to see many of you in sunny Bellevue, WA, USA soon.</p> <p> </p> <h2>Thoughts on a more powerful <em>and</em> simpler C++ (5 of N)</h2> <p>Perhaps the most important thing we can do for C++ at this point in its evolution is to make sure we preserve its core strengths while also directing its evolution in ways that make it simpler to use. That is my own opinion at least, and so this talk starts with a perspective question: What “is C++,” really? The language continues to evolve and change; as it does so, how can we be sure we’re picking C++ evolutionary improvements that not only don’t lose its “C++-ic” qualities, but make it a better C++ than ever?</p> <p>At recent CppCons, I’ve spoken about several of my own personal C++ evolution efforts and experiments, and why I think they’re potentially important directions to explore for making C++ both more powerful and also simpler to use. The bulk of the talk is updates on two of these:</p> <p><strong>Lifetime and dangling.</strong> At CppCon 2015, Bjarne Stroustrup and I launched <a href="https://github.com/isocpp/CppCoreGuidelines"><em>The C++ Core Guidelines</em></a> in our plenary talks. In <a href="https://www.youtube.com/watch?v=hEx5DNLWGgA&feature=youtu.be&t=29m6s">my part starting at 29:06</a>, I gave an early look at my work on the Guidelines “Lifetime” profile, an approach for diagnosing many common cases of pointer/iterator dangling at compile time, with demos in an early MSVC-based prototype. For this year’s CppCon, I’ll cover what’s new, including:</p> <ul> <li>use-after-move diagnoses</li> <li>better support for the standard library out of the box without annotation</li> <li>more complete implementations in two compilers: in MSVC as a static analysis extension, and in a Clang-based implementation that is efficient enough to run during normal compilation</li> <li>the complete 1.0 Lifetime specification being released on the Guidelines’ GitHub repo this month</li> </ul> <p>I’ll summarize the highlights but focus on what’s new, so I recommend <a href="https://www.youtube.com/watch?v=hEx5DNLWGgA&feature=youtu.be&t=29m6s">rewatching that talk video</a> as a refresher for background for this year’s session.</p> <p><strong>Metaclasses.</strong> In <a href="https://www.youtube.com/watch?v=4AfRAVcThyA&vl=en">my CppCon 2017 talk</a>, I gave an early look at my “metaclasses” proposal to use compile-time reflection and compile-time generation to make authoring classes both more powerful and also simpler. In this case, “simpler” means not only eliminating a lot of tedious boilerplate, but also eliminating many common sources of errors and bugs. For this year, we’ll cover what’s new, including:</p> <ul> <li>an update on the Clang-based implementation, which now supports more use cases including function parameter lists</li> <li>new examples, including from domains like concurrency</li> <li>an updated P0707 paper, with more links to working examples live on Godbolt, being posted in the next few weeks for the pre-San Diego committee mailing</li> </ul> <p> </p> </div> <footer class="entry-footer"> <div class="entry-meta"> <span class="byline"> <a href="https://herbsutter.com/author/herbsutter/" title="Posts by Herb Sutter" rel="author">Herb Sutter</a> </span> <span class="cat-links"> <a href="https://herbsutter.com/category/c/" rel="category tag">C++</a> </span> <span class="comments-link"><a href="https://herbsutter.com/2018/09/14/my-cppcon-2018-talk-title-and-abstract/#comments">6 Comments</a></span> <span class="published-on"> <a href="https://herbsutter.com/2018/09/14/my-cppcon-2018-talk-title-and-abstract/" rel="bookmark"><time class="entry-date published" datetime="2018-09-14T10:53:14-08:00">2018-09-14</time><time class="updated" datetime="2018-09-14T10:53:34-08:00">2018-09-14</time></a> </span> <span class="word-count">2 Minutes</span> </div> </footer> </article> </main> </div> <div id="secondary" class="widget-area" role="complementary"> <aside id="search-4" class="widget widget_search"><form role="search" method="get" class="search-form" action="https://herbsutter.com/"> <label> <span class="screen-reader-text">Search for:</span> <input type="search" class="search-field" placeholder="Search …" value="" name="s" /> </label> <input type="submit" class="search-submit" value="Search" /> </form></aside><aside id="blog_subscription-3" class="widget widget_blog_subscription jetpack_subscription_widget"><h1 class="widget-title"><label for="subscribe-field">Follow by email</label></h1> <div class="wp-block-jetpack-subscriptions__container"> <form action="https://subscribe.wordpress.com" method="post" accept-charset="utf-8" data-blog="3379246" data-post_access_level="everybody" id="subscribe-blog" > <p id="subscribe-email"> <label id="subscribe-field-label" for="subscribe-field" class="screen-reader-text" > Email Address: </label> <input type="email" name="email" style="width: 95%; padding: 1px 10px" placeholder="Email Address" value="" id="subscribe-field" required /> </p> <p id="subscribe-submit" > <input type="hidden" name="action" value="subscribe"/> <input type="hidden" name="blog_id" value="3379246"/> <input type="hidden" name="source" value="https://herbsutter.com/2018/09/"/> <input type="hidden" name="sub-type" value="widget"/> <input type="hidden" name="redirect_fragment" value="subscribe-blog"/> <input type="hidden" id="_wpnonce" name="_wpnonce" value="c1038c5b8c" /> <button type="submit" class="wp-block-button__link" > Subscribe </button> </p> </form> </div> </aside><aside id="block-2" class="widget widget_block widget_media_image"> <figure class="wp-block-image size-medium is-resized is-style-default"><a href="https://herbsutter.files.wordpress.com/2024/03/herb-cppcon-2021.jpg"><img loading="lazy" width="300" height="230" src="https://herbsutter.files.wordpress.com/2024/03/herb-cppcon-2021.jpg?w=300" alt="" class="wp-image-5065" style="width:248px;height:auto" srcset="https://herbsutter.files.wordpress.com/2024/03/herb-cppcon-2021.jpg?w=300 300w, https://herbsutter.files.wordpress.com/2024/03/herb-cppcon-2021.jpg?w=600 600w, https://herbsutter.files.wordpress.com/2024/03/herb-cppcon-2021.jpg?w=150 150w" sizes="(max-width: 300px) 100vw, 300px" /></a></figure> </aside><aside id="block-3" class="widget widget_block widget_text"> <p class="has-small-font-size">I'm an author and speaker, and a programming language nerd whose focus is on enabling our program code to be both clean <em>and</em> fast. I've been writing about programming since 1993, usually about C++ or about concurrency and parallelism. I'm the designer or co-designer of a number of standardized ISO C++ language and library features. I've served as the chair of the <a href="https://isocpp.org/std/the-committee">ISO C++ standards committee</a> since 2002, and as the chair of the <a href="https://isocpp.org/about">Standard C++ Foundation</a> since 2012. I'm a technical fellow at <a href="https://www.citadelsecurities.com/">Citadel Securities</a>. 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