How does hashing work in C++ unordered sets?

Can you explain how hashing works in C++ unordered sets?

Sure! In C++, unordered sets use a hash function to determine the index of elements. This allows for average constant time complexity for insertions, deletions, and lookups.

What happens if two elements hash to the same index?

That's called a collision. C++ handles collisions using separate chaining or open addressing, depending on the implementation.

How can I customize the hash function for my unordered set?

You can provide a custom hash function by using a functor or a lambda function when declaring your unordered set.

Are there any performance considerations I should be aware of?

Yes, the performance can degrade if the hash function leads to many collisions. It's important to choose a good hash function to minimize this.