"Modules will solve everything", people say -- some optimistically, others sarcastically. However, modules are far from reaching real-world maturity, and it is still not certain whether they will improve compilation times in every situation and how costly it will be to migrate a large codebase. Do we have to suffer with excruciating compilation times until we are able to migrate to modules? Not at all! If you are interested in learning about practical tools and techniques to improve compilation times on codebases of any size, *today*, this talk is for you! We will cover: - How to accurately benchmark the compilation time of a codebase and detect bottlenecks; - Enabling precompiled headers in CMake, leveraging the "reuse from" feature; - Automatically transforming your build into a "unity build"; - When to selectively replace heavyweight standard library headers; - General techniques to reduce physical dependencies between components.

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"Modules will solve everything", people say -- some optimistically, others sarcastically. However, modules are far from reaching real-world maturity, and it is still not certain whether they will i...

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The graphic framework Unreal Engine by Epic is one for the most popular and sophisticated game engines to create videogames but, more and more often, it is also used in other fields to build high-quality and stunning graphics interactive applications. The Unreal Engine learning curve is steep not only because of its large codebase but also because most of the developers use almost exclusively the "blueprints" with a graphical editor, with almost no-code. Behind the scenes there is of course C++ which thankfully is open source, but also very poorly documented. This makes the development process hard, with rare articles and videos showing C++ and its big advantages. In this session I will tell you my adventure as a novice in this world, how to create objects, the main libraries we can use and how to create animations.

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The graphic framework Unreal Engine by Epic is one for the most popular and sophisticated game engines to create videogames but, more and more often, it is also used in other fields to build high-q...

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C++ in safety critical domain. How to approach type safety in particular when it comes to safety critical domains e.g. Automotive. Challenges in domain, beyond C++14 solutions.

Video games are some of the largest and most complex codebases today, usually measured in millions of lines of codes, with extreme requirements in terms of performance and memory efficiency, and a ton of concurrency sprinkled everywhere. Game developers also operates in an industry whose tempo is often dictated by strict milestones and unmovable release windows. These factors make C++ the best friend, but also the worst enemy, of game coders. This talk will describe the AAA game development industry from a programmer's point of view (tools, environments, habits, processes and so forth), and recommend which bits of the language to embrace and which ones to stay away from. We will share lessons learned in developing a few videogames over the past 15 years. In particular, we will touch topics like concurrency, debugability, compilation time, memory management, hot-reloading, modern C++, data oriented design and functional style programming. Finally, we'll discuss what the future of game development might look like, and what are the challenges for C++ to stay relevant as the language of choice for game programmers in the future.

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Video games are some of the largest and most complex codebases today, usually measured in millions of lines of codes, with extreme requirements in terms of performance and memory efficiency, and a ...

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C++ is a big language -- the upcoming C++23 standard will be over 2000 pages long. This talk will cover some obscure features you might not know. We will cover strange syntax like commutative array indexing and complicated declarators, surprising cases of undefined behavior in frequently used operators contrasted with a surprising lack of undefined behavior in operations that really shouldn't work, overlooked language facilities -- some of them actually useful, and half-forgotten standard library functions -- some of them for good reason. For each feature, we will talk about the what, the why, and how you can use it to write better (or much, *much* worse) C++ programs.

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C++ is a big language -- the upcoming C++23 standard will be over 2000 pages long. This talk will cover some obscure features you might not know. We will cover strange syntax like commutative array...

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"Premature optimization is the root of all evil" is a saying credited to Donald Knuth that speaks to many programmers with experience -- nut anecdotally I have observed folks overlooking the next sentence stating: "Yet we should not pass up our opportunities in that critical 3%". In this talk, the audience will be introduced to some common optimization design patterns. I will discuss precomputation, lazy versus eager evaluation, batching, caching, specialization, hinting, hashing, and using your compiler among 'optimization design patterns' that every programmer should be aware of. Examples will be demonstrated in Modern C++, and the goal is for the audience to leave feeling comfortable implementing each optimization design pattern to improve performance of their code.

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"Premature optimization is the root of all evil" is a saying credited to Donald Knuth that speaks to many programmers with experience -- nut anecdotally I have observed folks overlooking the next s...

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C++23 has made a number of very important additions to the Ranges library that was introduced in C++20. This talk will be an overview everything new in the C++23 Ranges library as well as a high level overview of all the different "types" of algorithms in C++ (from C++98 to C++23).

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C++23 has made a number of very important additions to the Ranges library that was introduced in C++20. This talk will be an overview everything new in the C++23 Ranges library as well as a high le...

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Another talk in the micro-problems series, focused on showing small and clever pieces of code that solve practical problems, this talk will be focused on lock-free code and applications.

In the context of DSP, C++20's `std::span` offers a great abstraction, allowing the user to write a code once, that can work both at compile-time and at run-time. However, oftentimes data processing needs some memory space to store transient results or cache intermediate values. While `constexpr` memory allocation are allowed in C++20, functions which explicitly allocate are cumbersome for embedded systems, as the size of the allocation can't be checked at compile-time for correctness. In this talk I will try to explore first some design alternatives to give the user more control on where to store transient data, and then a case for non-virtual virtual inheritance as a means to share buffers among similar algorithms, together with some metaprogramming tricks to ease their usage.

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In the context of DSP, C++20's `std::span` offers a great abstraction, allowing the user to write a code once, that can work both at compile-time and at run-time. However, oftentimes data processi...

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C++ 23 introduces std::generator, a library facility that allows programmers to write ranges factories using coroutines, similarly to what can already be done in other languages.

Developers often look at the package managers of other languages with envy: Python (pip), Java (Maven, Gradle), Javascript (npm), Rust (Cargo). Arguably, the C++ ecosystem has challenges that are unique and not found in other languages, with decades of history. What is holding us back? With Conan, we aim to support this huge ecosystem: multiple build systems, managing and reusing system native libraries, static and dynamic/shared linking, multiple platforms, ability to cross-build, symbol visibility, propagation of usage requirements, and so on. All of these (and more!) place impossibly high expectations on a C++ package manager, in particular when developers want a powerful solution that doesn’t require them to compromise. This talk will describe and present these different challenges, define the problems, how different platforms and existing solutions like system package managers approach them, discuss potential solutions, and finally connect the dots to the latest Conan 2.0, explaining the rationale behind some of the newer approaches introduced in this recent major release, and why writing a C++ package manager is a bigger challenge than it seems.

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Developers often look at the package managers of other languages with envy: Python (pip), Java (Maven, Gradle), Javascript (npm), Rust (Cargo). Arguably, the C++ ecosystem has challenges that are u...

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C++ programmers often complain about the lack of features in the standard library. Many community favorites - like optional, variant and byte - took years to come in; networking is not available yet, and graphics is nowhere to be seen. But taking a closer look at the algorithms and data structures that are already available, it is easy to witness a world full of clever solutions and efficient ideas: from what it drives the STL containers, to clever implementations of algorithm's functions down to some of the tricks that ensure that 0-cost abstractions are, indeed, free. In this talk we will present 1 container and 4 famous algorithm that are taught in AIV during the first year, discuss how they work and how they are implemented in the standard library and show how those algorithm are used in the context of video-game programming.

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C++ programmers often complain about the lack of features in the standard library. Many community favorites - like optional, variant and byte - took years to come in; networking is not available ye...

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