Re: std::launder and its usage in Boost

From: Peter Dimov (pdimov_at_[hidden])
Date: 2022-02-18 21:30:22

Niall Douglas wrote:
> Your examples aren't right - launder is for telling the compiler that an escaped
> value must be assumed to have changed, even if the compiler is allowed to
> assume it has not. I modified your example thusly:
> https://godbolt.org/z/oosdK6GMo

This example isn't right either, because `f` can easily `emplace` something into
the passed `optional`. It needs to be https://godbolt.org/z/8qb79hK4E. Or, for
completeness, https://godbolt.org/z/xxWToPo6M.