What are hash functions in C++11?

What are hash functions in C++11?

Hash functions in C++11 are algorithms that take an input and produce a fixed-size string of bytes, typically a digest that uniquely represents the input data.

Can you give me an example of a hash function in C++11?

Sure! You can use the std::hash template to create a hash function for various data types. 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: " << hash << std::endl;
    return 0;
}

What are the common use cases for hash functions?

Common use cases for hash functions include data integrity verification, password storage, and implementing hash tables for efficient data retrieval.

Are there any security concerns with hash functions?

Yes, some hash functions can be vulnerable to collisions or pre-image attacks. It's important to use secure hash functions like SHA-256 for sensitive applications.