std::swap 【chatgpt】

std::swap  map变量数据交换....

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#include <iostream> #include <map> #include <string>   int main() {     std::map<std::string, std::string> myMap;       // 添加元素     myMap["key1"] = "value1";     myMap["key2"] = "value2";     myMap.insert(std::make_pair("key3", "value3"));       // 打印所有元素     for (const auto& pair : myMap) {         std::cout << "Key: " << pair.first << ", Value: " << pair.second << std::endl;     }       // 修改元素值     myMap["key2"] = "new value2";       // 删除元素     myMap.erase("key3");       // 查找元素     auto it = myMap.find("key1");     if (it != myMap.end()) {         std::cout << "Value of 'key1': " << it->second << std::endl;     } else {         std::cout << "Key 'key1' not found." << std::endl;     }       return 0; }