#include <iostream>
#include <map>
#include <string>

std::map<std::string, int> ages;

// *** before: ***
void oldWay() {
    // the full type had to be spelled out, and iterator types were long
    std::map<std::string, int>::const_iterator it = ages.find("Ann");
    if (it != ages.end())
        std::cout << it->first << " is " << it->second << "\n";

    for (std::map<std::string, int>::const_iterator i = ages.begin();
         i != ages.end(); ++i)
        std::cout << i->first << " ";
    std::cout << "\n";
}

// *** in version C++11: ***
void newWay() {
    auto it = ages.find("Ann");        // the type is taken from the initialiser
    if (it != ages.end())
        std::cout << it->first << " is " << it->second << "\n";

    auto count = 0;                    // int
    auto ratio = 1.5;                  // double
    auto name = std::string("Bob");    // std::string

    // auto drops the reference and const, so they are added by hand
    const auto& first = *ages.begin();

    std::cout << count << " " << ratio << " " << name
              << " " << first.first << "\n";
}

int main() {
    ages["Ann"] = 31;
    ages["Bob"] = 27;
    oldWay();
    newWay();
}