modern-cpp-tutorial/code/4/4.2.cpp

//
// 4.2.cpp
// modern c++ tutorial
//
// created by changkun at changkun.de
// https://github.com/changkun/modern-cpp-tutorial
//
// 无序容器

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

int main() {
    // 两组结构按同样的顺序初始化
    std::unordered_map<int, std::string> u = {
        {1, "1"},
        {3, "3"},
        {2, "2"}
    };
    std::map<int, std::string> v = {
        {1, "1"},
        {3, "3"},
        {2, "2"}
    };
    
    // 分别对两组结构进行遍历
    std::cout << "std::unordered_map" << std::endl;
    for( const auto & n : u)
        std::cout << "Key:[" << n.first << "] Value:[" << n.second << "]\n";
    
    std::cout << std::endl;
    std::cout << "std::map" << std::endl;
    for( const auto & n : v)
        std::cout << "Key:[" << n.first << "] Value:[" << n.second << "]\n";
}