C++ 11 map 遍历
输出示例如下：

代码如下

// 两种类型 map 示例
#include <iostream>
#include <map>
#include <string>

int main()
{
    std::map<char, std::string> mymap;

    mymap['a'] = "an element";
    mymap['b'] = "another element";
    mymap['c'] = mymap['b'];

    std::cout << "mymap now contains " << mymap.size() << " elements.\n";

    std::cout << "mymap['a'] is " << mymap['a'] << '\n';
    std::cout << "mymap['b'] is " << mymap['b'] << '\n';
    std::cout << "mymap['c'] is " << mymap['c'] << '\n';
    std::cout << "mymap['d'] is " << mymap['d'] << '\n';
    std::cout << " ______________ " << std::endl;

    for (auto &val : mymap)
    {
        std::cout << val.first << "->" << val.second << std::endl;
    }

    std::cout << "mymap now contains " << mymap.size() << " elements.\n";

    std::cout << " ______________ " << std::endl;

    std::map<char, int> map = {
        {'a', 1},
        {'b', 2},
        {'c', 3},
    };
    for (auto &val : map)
    {
        std::cout << val.first << "->" << val.second << std::endl;
    }

    return 0;
}

认识 C++11 auto类型推导