What are the differences between std::pair and structured bindings in C++17?

What are the differences between std::pair and structured bindings in C++17?

In C++17, std::pair is a utility for storing two values, while structured bindings allow unpacking tuples or pairs into separate variables.

Can you give me an example of how to use both?

Sure! With std::pair, you can do: std::pair<int, int> p(1, 2); and access values with p.first and p.second. For structured bindings: auto [x, y] = p; lets you directly use x and y.

Which one is more efficient?

Structured bindings can be more efficient as they avoid the overhead of creating a std::pair object, allowing for direct access to the values.

Are there any limitations to using structured bindings?

Yes, structured bindings require the type to be a tuple-like type, and they can't be used with all types, unlike std::pair.