simple case to remind myself how for loops work

loops.cpp

#include <iostream>

int main() {
    constexpr static int N = 20;


    for(int i = 0; i < N; ++i) {
        std::cout << i << ", ";
    }
    std::cout << std::endl;
    for(int i = 0; i < N; i++) {
        std::cout << i << ", ";
    }
    std::cout << std::endl;
    auto start = []()->int{std::cout <<"start(i=0)" << std::endl; return 0;};
    auto check = [](int i) -> bool { std::cout << "check(" << i << "<" << N << ")" << std::endl; return i < N; };
    auto increment = [](int i){std::cout << "Increment(" << i<<"++)"<<std::endl; return i+1;};
    

    for(int i = start(); check(i); i=increment(i)) {
        std::cout << "content(f(" << i << "))" << std::endl;
    }
}