What are some advanced techniques for using unordered maps in C++11?

What are some advanced techniques for using unordered maps in C++11?

In C++11, unordered maps offer several advanced techniques, such as custom hash functions, bucket management, and iterators. Would you like to explore any specific technique?

Can you explain how to implement a custom hash function?

Sure! To implement a custom hash function, you can create a struct that overloads the operator() to define your hashing logic. Then, you can use this struct as the second template parameter in your unordered map.

What about performance considerations when using unordered maps?

Performance considerations include understanding the load factor, choosing an appropriate hash function, and managing collisions effectively. Keeping the load factor low can help maintain constant time complexity.

Are there any common pitfalls to avoid?

Yes, common pitfalls include using non-unique keys, not handling collisions properly, and failing to account for the cost of rehashing when the load factor exceeds a certain threshold.