modern-cpp-tutorial/code/4/4.2.unordered.map.cpp at master · jiangrui/modern-cpp-tutorial · GitHub

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//
// 4.2.unordered.map.cpp
// chapter 04 containers
// modern c++ tutorial
//
// created by changkun at changkun.de
// https://github.com/changkun/modern-cpp-tutorial
//

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

int main() {
    // initialized in same order
    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"}
    };

    // iterates in the same way
    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";
}