Post #25832 6 Oct 10, 2026, 15:23 UTC Opting in, and back out againhttps://dryperspective.github.io/posts/opting-in/https://redd.it/1x2hhim@r_cpp Substitution Failure Opting in, and back out again The ways to manually opt your code into a function through the history of C++, and the black magic required to opt it back out again.