[C++ STL] <unordered_map>

🔎 Unordered map

• Synopsis

#include <unordered_map>

• 선언

// unordered_map<key, value>
unordered_map<string, vector<string>> user_info;

user_info["minsu"].push_back("ID");
user_info["minsu"].push_back("PASSWORD");
user_info["minsu"].push_back("SCORE");
user_info["minsu"].push_back(to_string(88));

user_info["younghee"].push_back("ID");
user_info["younghee"].push_back("PASSWORD");
user_info["younghee"].push_back("SCORE");
user_info["younghee"].push_back(to_string(97));

• empty( )

if (user_info.empty()) {
	cout << "This is Start. Unordered_map is Emptpy" << endl;
}

• size( )

cout << "Unordered_map's size is : " << user_info.size() << endl;

• count ( )

if (user_info.count("younghee")) {
	cout << user_info["younghee"][0] << " " << user_info["younghee"][1] << endl;
}

• find( )

if (user_info.find("younghee") != user_info.end()) {
		cout << user_info["younghee"][0] << " " << user_info["younghee"][1] << endl;
}