#include <iostream>
#include <functional>

int main() {
    const auto predicat = std::equal_to<>();
    std::cout << std::boolalpha;
    std::cout << predicat(1, 2) << std::endl;
    std::cout << predicat(1, 1.0) << std::endl;
    std::cout << predicat('a', 'b') << std::endl;
    std::cout << predicat('a', 'a') << std::endl;
    std::cout << predicat("azerty", "abcdef") << std::endl;
    std::cout << predicat("azerty", "azerty") << std::endl;
}