What are the best practices for using hash functions in C++11?

What are the best practices for using hash functions in C++11?

When using hash functions in C++11, it's important to ensure that your hash function is efficient and minimizes collisions. You should also consider using the standard library's std::hash for built-in types.

Can you explain how to implement a custom hash function?

To implement a custom hash function, you can define a struct and overload the operator() to provide your hashing logic. Make sure to combine the hash values of the object's members effectively.

What are some common pitfalls to avoid?

Common pitfalls include using mutable data in your hash function, which can lead to inconsistencies, and not handling edge cases, such as empty inputs.

How can I test the performance of my hash function?

You can test the performance of your hash function by measuring the time it takes to insert and retrieve elements in a hash table, and by analyzing the distribution of hash values.