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1.前言

本篇目的：理解C++之三种key-value键值生成方式。

2.应用实例

<1>.map方式

#include <iostream>
#include <vector>
#include <map>
int main() {std::map<std::string, std::string> keyValueMap;//v1.0keyValueMap = { {"name", "张三"}, {"age", "20"}, {"country", "中国"} };// 遍历map并打印键值对for (const auto& pair : keyValueMap) {std::cout << pair.first << ": " << pair.second << std::endl;}std::cout << std::endl;keyValueMap.clear();//v2.0keyValueMap.insert({"name","李四"});keyValueMap.insert({"age","18"});keyValueMap.insert({"country","China"});//遍历map并打印键值对for (const auto& pair : keyValueMap) {std::cout << pair.first << ": " << pair.second << std::endl;}std::cout << std::endl;return 0;
}

<2>.vector + pair方式

#include <iostream>
#include <vector>
#include <map>
int main() {//vector + pair//v1.0std::vector<std::pair<std::string, std::string>> keyValuevt;keyValuevt = { {"name", "王五"}, {"age", "22"}, {"country", "中国"} };for (const auto& vv : keyValuevt) {std::cout << vv.first << ": " << vv.second << std::endl;}std::cout << std::endl;keyValuevt.clear();//v2.0keyValuevt.push_back({"name","Tom"});keyValuevt.push_back({"age","10"});keyValuevt.push_back({"countyr","China"});for (const auto& vv : keyValuevt) {std::cout << vv.first << ": " << vv.second << std::endl;}return 0;
}

<3>.vector + make_pair方式

#include <iostream>
#include <vector>
#include <map>
int main() {std::vector<std::pair<std::string, std::string>> keyValuevt;//vector + make_pair//v1.0keyValuevt.push_back(std::make_pair("name", "六五"));keyValuevt.push_back(std::make_pair("age", "21"));keyValuevt.push_back(std::make_pair("country", "中国"));for (const auto& vv : keyValuevt) {std::cout << vv.first << ": " << vv.second << std::endl;}std::cout << std::endl;keyValuevt.clear();//v2.0keyValuevt.push_back({"name","Tom"});keyValuevt.push_back({"age","10"});keyValuevt.push_back({"countyr","China"});for (const auto& vv : keyValuevt) {std::cout << vv.first << ": " << vv.second << std::endl;}return 0;
}