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A comment on A Tour of C++, 3rd edition (covering C++20 plus a few likely features of C++23). Parent comment

Re:A Tour of C++, 3rd edition (covering C++20 plus a few lik... by alexeiz on Sunday October 30, 2022 @12:32PM (#33395877)
> Can safely implement scope guards

Can you elaborate on this?

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Re:A Tour of C++, 3rd edition (covering C++20 plus a few lik... by einpoklum on Sunday October 30, 2022 @02:22PM (#33397132)
A count of the number of exceptions in-flight was added, replacing the boolean indication of whether an exception is in-flight. This allows the scope guard construct proposed by Andrei Alexandrescu to distinguish between a scope being left on success and on an exception being thrown.

YouTube video about scope guard: https://www.youtube.com/watch?v=WjTrfoiB0MQ

Description of the change to the standard: https://isocpp.org/files/papers/N4152.pdf

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