STL＿map

【実行結果】

#include <iostream>
#include <map>
using namespace std;

int main(){
	map<string, int> testMap;

	testMap["test"] = 1234;
	if(testMap.find("test") != testMap.end()){
		int i = testMap["test"];
		cout << "test   : " << i << "\n" << endl;
	}

	cout << "count  : " << (unsigned int)testMap.size() << "\n" << endl;

	testMap.insert(map<string, int>::value_type("aaa", 1));
	testMap.insert(map<string, int>::value_type("bbb", 22));
	testMap.insert(map<string, int>::value_type("ccc", 333));

	for(map<string, int>::iterator it = testMap.begin();it != testMap.end();++it){
		string s = it->first;
		int i = it->second;
		cout << "string : " << s << endl;
		cout << "int    : " << i << endl;
	}

	cout << "\ncount  : " << (unsigned int)testMap.size() << "\n" << endl;

	cout << "クリアします" << endl;
	testMap.clear();
	cout << "count  : " << (unsigned int)testMap.size() << "\n" << endl;

	cout << "再度出力してみます" << "\n" << endl;
	for(map<string, int>::iterator it = testMap.begin();it != testMap.end();++it){
		string s = it->first;
		int i = it->second;
		cout << "string : " << s << endl;
		cout << "int    : " << i << endl;
	}

	return 0;
}

　
【実行結果】

test   : 1234

count  : 1

string : aaa
int    : 1
string : bbb
int    : 22
string : ccc
int    : 333
string : test
int    : 1234

count  : 4

クリアします
count  : 0

再度出力してみます