g++でhash mapを使う

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

/** 
* $Id: hashmap-by-using-STL.html,v 1.1 2009/06/22 16:12:12 kishi Exp kishi $
*/

using namespace std;

int
main (int argc, char *argv[])
{

  map < string, string > mymap;
  map < string, string >::iterator iter;	// イテレータ

  mymap["北海道"] = "Hokkaido";
  mymap["青森"] = "Aomori";
  mymap["秋田"] = "Akita";
  mymap["岩手"] = "Iwate";
  mymap["山形"] = "Yamagata";
  mymap["宮城"] = "Miyagi";
  mymap["福島"] = "Fukushima";

  // イテレータを使って全要素を列挙
  for (iter = mymap.begin (); iter != mymap.end (); iter++) {
    cout << (*iter).first << " is the japanese word for " << iter->
      second << endl;
  }

  // 要素を追加
  mymap["東京"] = "Tokyo";

  // イテレータを使って全要素を列挙
  printf ("\n");
  for (iter = mymap.begin (); iter != mymap.end (); iter++) {
    cout << (*iter).first << " is the japanese word for " << iter->
      second << endl;
  }

  // 要素にキーを使って直接アクセスする
  printf ("\n");
  cout << "東京＝" << mymap["東京"] << endl;

  return 0;
}

■実行結果

$ !make && ./my-hash-test.exe
make my-hash-test && ./my-hash-test.exe
g++     my-hash-test.cpp   -o my-hash-test
岩手 is the japanese word for Iwate
宮城 is the japanese word for Miyagi
山形 is the japanese word for Yamagata
秋田 is the japanese word for Akita
青森 is the japanese word for Aomori
福島 is the japanese word for Fukushima
北海道 is the japanese word for Hokkaido

岩手 is the japanese word for Iwate
宮城 is the japanese word for Miyagi
山形 is the japanese word for Yamagata
秋田 is the japanese word for Akita
青森 is the japanese word for Aomori
東京 is the japanese word for Tokyo
福島 is the japanese word for Fukushima
北海道 is the japanese word for Hokkaido

東京＝Tokyo

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