Perfect Forwarding And Universal Reference

Friday, January 17, 2020

While I was learning mtrebi's threadpool implementation, I noticed some peculiar usage of &&, which looked like this. template<typename F, typename...Args> auto submit(F&& f, Args&&... args) -> std::future<decltype(f(args...))> { && is known for rvalue reference in C++, but what does it mean in this context? To answer this question, I did some research and figured it was called universal reference. The term universal reference was coined by Scott Meyers, and it is used to describe references that may be either lvalue references or rvalue references may bind to anything.…more