Timur Doumler — Type punning in modern C++

Ближайшая конференция: С++ Russia 2024, 24 мая (online), 2–3 июня (offline, Москва)
Подробности и билеты: https://jrg.su/W8skjE
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. . . Type punning is often used in C++ for fast floating-point math, deserialising C++ objects from a sequence of bytes, and other purposes. Popular techniques involve unions, reinterpret_cast, and memcpy. C++20 provides new useful tools, such as bit_cast. And there are proposals to provide even better control over C++ object creation in the future.

This talk is a comprehensive overview of all of these techniques. We will discuss when and how they can be used safely without causing undefined behaviour, what C++ does and does not allow you to do (and why), existing holes in the C++ language, and how to fix them. In the process, we will cover important C++ concepts such as object lifetime, value representations, and aliasing rules.

Видео Timur Doumler — Type punning in modern C++ канала C++ User Group