On Tue, May 21, 2024 at 2:15 PM Sebastian Wittmeier wrote
>
> Another more flexible variant could be a
>
> template<class T>
> std::forward_modified(Callable getter, Callable modifier);
>
> which would not construct the initial object by itself, but take the return value of another function as argument (with guaranteed RVO).
>
> return std::forward_modified(getmutex, lockit);


Implemented by combining 'std::elide' with 'std::factory':

    https://msvc.godbolt.org/z/9EMP6zzoe