How can I implement a custom hash function in C++?

How can I implement a custom hash function in C++?

To implement a custom hash function in C++, you can define a function that takes an input and returns a hash value. You can use techniques like bit manipulation or prime number multiplication.

Can you show me a simple example of a hash function?

Sure! Here's a simple example:

#include <iostream>
#include <string>

unsigned int customHash(const std::string &key) {
    unsigned int hash = 0;
    for (char c : key) {
        hash = hash * 31 + c;
    }
    return hash;
}

What are some common use cases for custom hash functions?

Common use cases include implementing hash tables, ensuring data integrity, and creating unique identifiers for objects.

How do I handle collisions in my hash function?

You can handle collisions using techniques like chaining (linked lists) or open addressing (probing). Each method has its pros and cons.