Discussion

Best performance of a C++ singleton

m-schuetz: I liked using singletons back in the day, but now I simply make a struct with static members which serves the same purpose with less verbose code. Initialization order doesn't matter if you add one explicit (and also static) init function, or a lazy initialization check.

swaminarayan: Nice breakdown. I’m curious how often the guard check for a function-local static actually shows up in real profiles. In most codebases Instance() isn’t called in tight loops, so the safety of lazy initialization might matter more than a few extra instructions. Has anyone run into this being a real bottleneck in practice?

signa11: i am not sure why this entire article is warranted :o) just use `std::call_once` and you are all set.