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CppCon 2023 std::linalg: Linear Algebra Coming to Standard C++ -- Mark Hoemmen

By Blog Staff | Jul 14, 2024 09:57 AM | Tags: None

Registration is now open for CppCon 2024! The conference starts on September 15 and will be held in person in Aurora, CO. To whet your appetite for this year’s conference, we’re posting videos of some of the top-rated talks from last year's conference. Here’s another CppCon talk video we hope you will enjoy – and why not register today for CppCon 2024!

CppCon 2023 std::linalg: Linear Algebra Coming to Standard C++

by Mark Hoemmen

Summary of the talk:

Many fields depend on linear algebra computations, which include matrix-matrix and matrix-vector multiplies, triangular solves, dot products, and norms. It's hard to implement these fast and accurately for all kinds of number types and data layouts. Wouldn't it be nice if C++ had a built-in library for doing that? Wouldn't it be even nicer if this library used C++ idioms instead of what developers have to do now, which is write nonportable, unsafe, verbose code for calling into an optimized Fortran or C library?

The std::linalg library does just that. It uses the new C++23 feature mdspan to represent matrices and vectors. The library builds on the long history and solid theoretical foundation of the BLAS (Basic Linear Algebra Subroutines), a standard C and Fortran interface with many optimized implementations. The C++ Standard Committee is currently reviewing std::linalg for C++26. The library already has two implementations that work with C++17 or newer compilers, and can take advantage of vendor-specific optimizations. Developers will see how std::linalg can make their C++ safer and more concise without sacrificing performance for use cases that existing BLAS libraries already optimize, while opening up new use cases and potential optimizations.

CppCon 2023 Spanny: Abusing C++ mdspan Is Within Arm’s Reach -- Griswald Brooks

By Blog Staff | Jul 12, 2024 01:52 PM | Tags: None

Lightning Talk: Spanny: Abusing C++ mdspan Is Within Arm’s Reach

by Griswald Brooks

Summary of the talk:

mdspan introduced in C++23 gave us a standard multidimensional way to view into a container of data. While the canonical use case is to refer to a stack or heap allocated data, the accessor policy allows you to inject any side effect allowing the data to come from anywhere... like a robot arm inspecting bins.

CppCon 2023 Robots Are After Your Job: Exploring Generative AI for C++ -- Andrei Alexandrescu

By Blog Staff | Jul 8, 2024 11:27 AM | Tags: None

Robots Are After Your Job: Exploring Generative AI for C++

by Andrei Alexandrescu

Summary of the talk:

Almost a year since the launch of ChatGPT – considered by many as the first truly compelling code generator that translates free-form human language into code – the C++ community continues to grapple with the implications. Reactions range from indifference or skepticism to genuine concern about the future of human programmers.

Although some advanced C++ techniques are already accessible to tools like ChatGPT, certain fundamental aspects remain outside the reach of current and possibly next-generation generative AI tools. This disparity raises pivotal questions: Which parts of the intricate C++ ecosystem can we confidently delegate to generative AI? What uniquely human skills must we retain and refine?

We'll probe the potential and limits of contemporary AI, taking a novel look at the age-old binary search algorithm. Although this algorithm has long been held up as a paragon of efficiency, we challenge that notion. What would ChatGPT have to say about it, and how might it partner with us to refine this cornerstone of algorithmic logic? The conversation opens a window into a future where developers become the "one percenters" of programming—focusing solely on the most cerebral and high-level challenges, while AI takes care of the everyday tasks. Join us to explore this fascinating paradigm shift and reflect on what it means for your own work in and with C++.

CppCon 2023 Coping With Other People's C++ Code -- Laura Savino

By Blog Staff | Jul 6, 2024 11:25 AM | Tags: None

Plenary: Coping With Other People's C++ Code

by Laura Savino

Summary of the talk:

Sometimes we're fortunate enough to work with a small group of devs who share our coding values, and when we see their PRs come in, we nod along and say, "Yup, that's what I would have done. Oh, nice, that one's even better than my usual approach, I'd better tuck that idea away for next time."

This perfect alignment is precious... and particularly elusive in C++. Most of us are living in codebases that are profitable, complex, and updated in ways with which we have legitimate beef. How can we keep a sense of curiosity, progress, and satisfaction amidst patterns we would never have chosen?

This presentation explores the often-overlooked social aspects of C++ development, offering both practical tools and light-hearted commiseration. We'll draw from the field of behavior science to build strategies that address conflicting design patterns and the strong opinions that come with them.

CppCon 2023 Writing a Better std::move -- Jonathan Müller

By Blog Staff | Jul 1, 2024 11:22 AM | Tags: None

Lightning Talk: Writing a Better std::move

by Jonathan Müller

Summary of the talk:

std::move allows the creation of const rvalue references, which is almost always wrong. It also allows moving out of lvalue references, which can be dangerous since you don't have real ownership over them and a caller might not expect the object to disappear. Let's fix those problems using macros, reflection, and more macros.

CppCon 2023 Linkers, Loaders and Shared Libraries in Windows, Linux, and C++ -- Ofek Shilon

By Blog Staff | Jun 28, 2024 11:19 AM | Tags: None

Linkers, Loaders and Shared Libraries in Windows, Linux, and C++

by Ofek Shilon

Summary of the talk:

This talk would give a crash-intro to linkers, loaders and the layout of program binaries, and explore just enough internals to understand some observable differences in C++ builds between Linux and Windows.

We will discuss the GOT, the PLT, symbol visibility, interposition, lazy binding and more. There will be a lot of details, but also a lot of 'why's and opinions.

We will also touch/rant on what the C++ standard has to say on adjacent matters. There's a good chance you've heard before "shared libraries are outside the scope of the standard", but it doesn't mean what you think it does.

CppCon 2023 Libraries: A First Step Toward Standard C++ Dependency Mgmt--Bret Brown & Bill Hoffman

By Blog Staff | Jun 27, 2024 11:14 AM | Tags: None

Plenary: Libraries - A First Step Toward Standard C++ Dependency Management

by Bret Brown & Bill Hoffman

Summary of the talk:

Prebuilt libraries have existed for decades… they even predate C++! After all these years, techniques to use prebuilt libraries are still ad hoc and difficult to maintain. A root cause of this variety of techniques is the variety of things that are C++ libraries: header-only libraries, statically-linked archives, dynamically-linked binaries, and so on. The consuming projects need to build against these libraries in consistent ways or risk unproductive workflows – and potentially, even catastrophic failure in production environments. This lack of convergence creates enormous interoperability problems across broad portions of the worldwide programming ecosystem, not just the C++ parts of it.

This talk will explore the complexities of defining what is a “C++ library.” It will then present the joint work of Kitware, Bloomberg, and others toward a preliminary design for creating initial standards for dependency management in C++ – metadata files to describe prebuilt libraries. A roadmap for maturing the design will also be shared, including proposing a standard definition for C++ libraries, building on previous proposals such as P1313: Package Specification (https://wg21.link/P1313).

This talk is intended for anyone who produces, maintains, or consumes C++ libraries. Special knowledge of C++ tooling, build systems, or package managers is not required.

Sean Baxter: Safe C++

By Jordi Mon Companys | Jun 27, 2024 07:33 AM | Tags: safety

Sean Baxter demonstrates memory safe C++ using his Circle compiler

Safe C++
Sean Baxter

From the talk:

Does a subset of a superset of C++ exists that achieves similar safety guarantees to rust, is useful and expressive enough, and is compatible with today's C++? If so, is anyone mad enough to do it? There is an answer to that

CppCon 2023 Let's Fix Sparse Linear Algebra with C++. It'll Be Fun and Easy! -- Benjamin Brock

By Blog Staff | Jun 24, 2024 11:11 AM | Tags: None

Lightning Talk: Let's Fix Sparse Linear Algebra with C++. It'll Be Fun and Easy!

by Benjamin Brock

Summary of the talk:

Sparse linear algebra is hard. There are a large variety of different sparse linear algebra formats, and they all require obtuse index arithmetic in order to use. But what if we could fix this? In this talk, I'll present an idea for "fixing sparse linear algebra" using customization points, the ranges library, and high-level multi-dimensional iteration.

CppCon 2023 Implementing Coroutines Using C++17 -- Alon Wolf

By Blog Staff | Jun 22, 2024 11:08 AM | Tags: None

Lightning Talk: Implementing Coroutines Using C++17

by Alon Wolf

Summary of the talk:

In this lightning talk, we will explore the journey of implementing coroutines in C++17 before they were added to the language in C++20.

The implementation uses macros, template metaprogramming, assembly functions, and more that resulting in working coroutines despite somewhat "horrible" code.

Discover how local variables within the coroutine body were leveraged to calculate frame sizes and ensure correct variable lifetimes during suspension, resumption, and destruction.

Safe C++ Sean Baxter

Safe C++
Sean Baxter