> exceptions are slow There are proposals to introduce better exceptions into C++. Like this: https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0709r0.

> exceptions are slow There are proposals to introduce better exceptions into C++. Like this: https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0709r0.pdf https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p07.... But until it's not in the standard, people should use std::expceted instead.