2.06.auto.cpp

//
// 2.6.auto.cpp
// chapter 2 language usability
// modern cpp tutorial
//
// created by changkun at changkun.de
// https://github.com/changkun/modern-cpp-tutorial
//

#include <initializer_list>
#include <vector>
#include <iostream>

class MagicFoo {
public:
    std::vector<int> vec;
    MagicFoo(std::initializer_list<int> list) {
        for (auto it = list.begin(); it != list.end(); ++it) {
            vec.push_back(*it);
        }
    }
};

int add(auto x, auto y) { // Supported in C++20
    return x+y;
}

int main() {
    MagicFoo magicFoo = {1, 2, 3, 4, 5};
    std::cout << "magicFoo: ";
    for (auto it = magicFoo.vec.begin(); it != magicFoo.vec.end(); ++it) {
        std::cout << *it << ", ";
    }
    std::cout << std::endl;

    auto i = 5;                    // type int
    auto j = 6;                    // type int
    std::cout << add(i, j) << std::endl;

    auto arr = new auto(10);       // type int*
    // auto auto_arr2[10] = {arr}; // invalid
    return 0;
}