How does collision handling work in C++11's std::unordered_map?

Can you explain how collision handling works in C++11's std::unordered_map?

Sure! In C++11, std::unordered_map uses hash tables to store key-value pairs. When two keys hash to the same index, a collision occurs.

What happens to the values when a collision occurs?

When a collision occurs, std::unordered_map uses a technique called chaining, where multiple elements are stored in a linked list at that index.

Is there a performance impact due to collisions?

Yes, collisions can impact performance. The more collisions there are, the longer it takes to find or insert elements, as it may require traversing the linked list.

How can I minimize collisions in my unordered_map?

To minimize collisions, you can choose a good hash function and ensure that your keys are well-distributed across the hash table.