modern-cpp-tutorial/code/2/2.11.for.loop.cpp

//
// 2.11.for.loop.cpp
// chapter 2 language usability
// modern cpp tutorial
//
// created by changkun at changkun.de
// https://github.com/changkun/modern-cpp-tutorial
//

#include <iostream>
#include <vector>
#include <algorithm>

int main() {
    std::vector<int> vec = {1, 2, 3, 4};
    if (auto itr = std::find(vec.begin(), vec.end(), 3); itr != vec.end()) *itr = 4;
    for (auto element : vec)
        std::cout << element << std::endl; // read only
    for (auto &element : vec) {
        element += 1;                      // writeable
    }
    for (auto element : vec)
        std::cout << element << std::endl; // read only
}