CppCon 2020

You may have heard of std::reference_wrapper's role in make_tuple, but this is not today's topic. The role that reference_wrapper plays is larger than unwrapping references in C++ standard library API. It is the language's response to the need for references with rebinding semantics, which may explain why such a small utility is still receiving love and polishes in C++20.
To put it in the other way, every reference in Python is rebindable -- with garbage collection, of course. But the semantics in common implies that reference_wrapper may be very useful. This talk will go through these use cases, see how reference_wrapper's design carefully enables them through details. The talk will also compare reference_wrapper with other facilities in the language and the standard library to give you hints about how to choose from the reference-like types.