Post #1969250

Josuttis's books are normally pretty good, lots of examples and a clear explanation of **why** you might want to use something, but oof that looks akin to a kick in the essentials. Even if you've no other reason to update to C++20, the fact that `if constexpr` gets rid of half the things you'd previously need to use SFINAE for, and concepts gets rid of the other half, makes it well worthwhile. Amazing how much it stops hurting when you stop doing ridiculous things.