I learned about the new range API of std::optional from Steve Downey at CppCon 2025 during his talk about std::optional<T&>. To be honest, I found the idea quite strange at first. I wanted to dig deeper to understand the motivation and the implications.The first example I encountered was this:1 2 3 4 5 6 7 void doSomething(std::string const& data, std::optional<Logger&> logger = {}) { for (auto l : logger) { l.log(data); } return; } This shows that you can iterate over an optional. In fact, iter...