This presentation was recorded at GOTO Copenhagen 2025. #GOTOcon #GOTOcph
https://gotocph.com

Daniela Engert - Hardware Hacker and Software Engineer @DanielaEyt 

RESOURCES
https://hachyderm.io/@DanielaKEngert
https://bsky.app/profile/danielae.bsky.social
https://x.com/DanielaKEngert
https://github.com/DanielaE
https://codeberg.org/DanielaE

Links
https://godbolt.org/z/Tc13f7YbT
https://godbolt.org/z/Trzo7rcPG
https://youtu.be/t7EJTO0-reg
https://www.cisa.gov/case-memory-safe-roadmaps
https://isocpp.org/files/papers/P2900R6.pdf
https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3081r1.pdf
https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3589r2.pdf

ABSTRACT
There is a perceived push towards memory-safe languages in the developer community. Various administrative bodies want to see a reduction in avoidable vulnerabilities in commonly used software. These vulnerabilities may cause harm of people, equipment, and property.

Long-term efforts in the standardization of C++ look like to become available in C++26. There is a wide range of proposals to improve the language, and merging them into the international standard is of utmost priority to the C++ committee.

We will look at those proposals, their current status in the upcoming C++26 standard, and the potential impact on the ecosystem and the development landscape. [...]

TIMECODES
00:00 Intro
02:50 Agenda
03:52 Security & safety
09:18 Safety in our code, or the lack thereof
17:52 Constant evaluation
24:26 New features in C++26
33:56 Options for the future
34:31 Summary
35:35 Outro

Download slides and read the full abstract here:
https://gotocph.com/2025/sessions/3728

RECOMMENDED BOOKS
Patrice Roy • C++ Memory Management • https://amzn.to/3K4gnet
Sy Brand • Building a Debugger • https://amzn.to/4cWWr84
Andreas Zeller • The Debugging Book • https://www.debuggingbook.org
Bjarne Stroustrup • Programming: Principles and Practice Using C++ • https://amzn.to/3I5Q335
Marius Bancila • Modern C++ Programming Cookbook • https://amzn.to/41ES4Kd

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A conference talk transcript covering safety and security improvements coming in C++26. Key topics include: the shift from undefined behavior to erroneous behavior for uninitialized variable reads, the power of constant evaluation as a compile-time undefined behavior detector, standard library hardening (P2900-adjacent) for bounds checking via std::span, and the upcoming contracts feature (P2900) enabling pre/post conditions and contract assertions with configurable violation semantics. The speaker also briefly mentions profiles (deferred to C++29) and future work on lifetime safety and race conditions. Practical advice emphasizes using value initialization, strong types, std::span, and simplicity to reduce vulnerabilities.

Towards Safety & Security in C++26 • Daniela Engert • GOTO 2025