What are some examples of hash functions in C++?

Can you give me some examples of hash functions in C++?

Sure! Common hash functions in C++ include std::hash, MurmurHash, and SHA-256. Would you like to see code examples?

Yes, please show me how to use std::hash.

Here's a simple example:

#include <iostream>
#include <functional>

int main() {
    std::hash<std::string> hash_fn;
    std::string str = "Hello, World!";
    size_t hash = hash_fn(str);
    std::cout << "Hash of \"" << str << "\" is: " << hash << std::endl;
    return 0;
}

This will compute the hash of the string "Hello, World!".

What about MurmurHash? How does it compare?

MurmurHash is known for its speed and good distribution. It's often used in hash tables. Here's a basic example:

#include <iostream>
#include <MurmurHash3.h>

int main() {
    const char* key = "Hello, World!";
    uint32_t hash;
    MurmurHash3_x86_32(key, strlen(key), 0, &hash);
    std::cout << "MurmurHash of \"" << key << "\" is: " << hash << std::endl;
    return 0;
}

This computes a 32-bit hash.