Agenda  Compile-Time Rational Numbers  Durations  Clocks  Time Points  Dates  Time Zones 4 Agenda  Compile-Time Rational Numbers  Durations  Clocks  Time Points  Dates Dates  Time Zones5 Compile-Time Rational Numbers  Defined in  Work with rational numbers at compile time  Always normalized representation  Needed for durations in the library6 library6 Compile-Time Rational Numbers  Define a rational number: using r1 = ratio<1, 60>; // Represents 1/60  Retrieve numerator and denominator intmax_t num { r1::num }; intmax_t den { r1::den };

More Tests Production Detecting errors early in the development pipeline reduces costs, saves time, minimizes risk, and improves efficiency.Error Reporting - Goals Error messages should be clear, risks if used improperlyCompile-time Validation CompilerMech Suit or Swim? Choose between safety and flexibilityMech Suit that Swims Safety and flexibility at the same time Source: Gurren LaganRuntime report_error(error); } }Runtime Error Reporting Runtime error reporting can be used with compile-time error detection void foo(){ constexpr auto error = detect_error(); if constexpr (error) {

compile time instrumentation Przemysław Delewski February 18, 2025 Warsaw, PolandAgenda 1. Short bio 2. Observability domain 3. OpenTelemetry 4. History of OpenTelemetry go compile time instrumentation to work on brand new navigation stack. I’m also founding member of the OpenTelemetry Go compile-time instrumentation project https://github.com/open-telemetry/community/blo b/main/projects/go-compile-instrumentation -instrumentation/ Blog post https://opentelemetry.io/blog/2025/go-compile-time-instrumentation/Thank you! Go compile time instrumentation Przemysław Delewski

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in game jams. • Enjoy experimenting, exploring, and trying new things in C++.Dive Into Compile-Time Parsers Libraries Use Cases Implementation Techniques Reflection Language Evolution API Design overloading • Domain specific languages • Open source compile-time libraries • API • Design • Implementation details • Using compile-time parsers • Reflection • Examples: functions, types, treesParser parser("SELECT id, name WHERE age > 42"); std::vector result = func(cats);Example – Compile Time Parsers std::vector cats = { /*...*/ }; constexpr auto parser = create_parser(); constexpr

Stephen Brawner, Robottimo Robotics at Compile Time Optimizing Robotics Algorithms with c++’s Compile-Time FeaturesAbout me • Robotics Software Consultant based in Portland, OR • Chief Roboticist types of robots • Parses robot description from a plain-text file format • Requires lots of run-time decisions • Generally maintained by a corporate entity • ROS and ROS 2 ecosystem (Open Robotics/ platforms in mind • Generally required for real-time controls• video of FLX BOTRobotics Hardware Development • Requirements known well ahead of time • Mechanical and electrical designs are locked-in

CPPCON / 16TH SEPTEMBER 2020 CPPCON / 16TH SEPTEMBER 2020 JUST-IN-TIME COMPILATION: JUST-IN-TIME COMPILATION: THE NEXT BIG THING? THE NEXT BIG THING? BEN DEANE & KRIS JUSIAK - BEN DEANE & KRIS JUSIAK 3 . 2WHAT IS JITTING? WHAT IS JITTING? INSTEAD OF AHEAD-OF-TIME (AOT), AKA "THE NORM": IT'S LIKE THE APPLICATION INSTEAD OF AHEAD-OF-TIME (AOT), AKA "THE NORM": IT'S LIKE THE APPLICATION (/LIBRARY) IS 3 . 2WHAT IS JITTING? WHAT IS JITTING? INSTEAD OF AHEAD-OF-TIME (AOT), AKA "THE NORM": IT'S LIKE THE APPLICATION INSTEAD OF AHEAD-OF-TIME (AOT), AKA "THE NORM": IT'S LIKE THE APPLICATION (/LIBRARY) IS

Just-in-Time Compilation A lecture on the last 60 years JF Bastien Software architect @jfbastien Presented at CppCon 2020. Just-in-Time compilers... we've all heard of them! What are they really want them, are they actually a good idea, and how do they fit in with C++ since we all use Ahead-of-Time compilers? In this talk I'll tell you about C++ AoT compiler, JiTs for dynamic language, JiTs for compilers. I'll illustrate how our view of compilers is really monolithic, and how compilers through time, and still today, are actually a continuum.Papers in this talk github.com/jfbastien/jit-talk CppCon

1/ Introduction Explore how C++20's constexper features can: Generate data from code at compile-time Be used to construct: Lookup Tables Con�guration Fuses Compressed Strings USB Descriptors 2 . 1/ building compile-time libraries 2 . 2/ constexpr in Brief Speci�es a variable or function CAN appear in a constant expression Constant expressions can be evaluated at compile-time eg: Array size non-type produce a compile-time constant Implies constexpr 4/ constinit Speci�es a variable has static initialization constant initialised (from a constant expression) computed at compile-time, and stored in

Gela Malek Pour gmalekpour@esri.com Visualize Time Enabled Data using ArcGIS Qt (C++) and ToolkitAbout Esri • We build mapping technology that our customers use to solve the world’s most complex challenges around the worldPurpose of this talk • Showcase a quick way to create a desktop app to visualize time enabled data • Setup the development environment using Esri templates • Use the ArcGIS toolkit to feature layer that include hurricane data as features • Each feature has a specific start time and end time in the feature table • We will use these start and end date values to draw and clear features

AI, Inc. Errors have a high cost, so rigorous testing is a must We use increasingly more compile-time polymorphism and checks Question: how to test if something is compilable in a rigorous way? We use std::enable_if_t< std::is_floating_point_v>© 2021 Apex.AI, Inc. Code has a tendency to evolve with time template< class T, class = std::enable_if_t>> T get_half_of(T smth) return smth / T{2}; } image: Flaticon.com© 2021 Apex.AI, Inc. Code has a tendency to evolve with time template< class T, class = std::enable_if_t>> T get_half_of(T smth)