I've decided to implement Python's any in C++. I've gone about this using templates to allow multiple types of data to be passed, instead of overloading the function multiple times. This is my first time using templates so I would really like feedback about my usage of them. I'm also fairly new with references and pointers, so I would like some criticism about my use of them as well. Of course, anything else is on the table and appreciated.

While writing this program, I realized std::any_of existed. So yes, I do know there's already a built-in method for this.

any.hpp

#ifndef ANY_HPP_INCLUDED
#define ANY_HPP_INCLUDED

/**
 * @author Ben Antonellis
**/

#include <vector>
#include <iostream>

/**
 * Returns True if any of the elements meet the callback functions parameters.
 * 
 * @param elements - A list of elements.
 * @param callback - Callback function to invoke on each element.
 * 
 * @return bool - True if parameters are met, False otherwise.
**/
template <typename List, typename Function>
bool any(List &elements, Function *callback) {
    for (auto element : elements) {
        if (callback(element)) {
            return true;
        }
    }
    return false;
}

#endif

And here's how I'm testing this function:

main.cpp

/**
 * @author Ben Antonellis
**/

#include "Any.hpp"

int main() {

    std::vector<double> doubleElements = {-1.0, -2.0, -3.0};
    std::vector<std::string> stringElements = {"Hello", "Goodbye", "Testing 123"};

    auto doubleFunc = [] (double number) {
        return number < 0;
    };
    auto stringFunc = [] (std::string string) {
        return string.length() >= 5;
    };

    /* Test Any Implementation */
    if (any(doubleElements, *doubleFunc)) {
        std::cout << "(any) Double Success." << std::endl;
    }
    if (any(stringElements, *stringFunc)) {
        std::cout << "(any) String Success." << std::endl;
    }

    return 0;
}

If you would like to compile and run, below is the script I'm using to compile and run this program.

run.sh

# Compile c++ program to .o file #
g++ -std=gnu++2a -c main.cpp # gnu++2a = Working draft for ISO C++ 2020 with GNU extensions #

# Compile .o file to executable #
g++ main.o -o app

# Run the executable #
./app

# Delete executable and .o files after running #
rm app main.o