hash_map::begin

참고

이 API는 사용되지 않습니다.unordered_map 클래스를 대신 사용하는 것이 좋습니다.

Returns an iterator addressing the first element in the hash_map.

const_iterator begin( ) const; 
iterator begin( );

반환 값

A bidirectional iterator addressing the first element in the hash_map or the location succeeding an empty hash_map.

Remark

If the return value of begin is assigned to a const_iterator, the elements in the hash_map object cannot be modified. If the return value of begin is assigned to an iterator, the elements in the hash_map object can be modified.

Visual C++.NET 2003에서, <hash_map> 및 <hash_set> 헤더 파일의 멤버는 더 이상 std 네임스페이스에 존재하지 않습니다. 대신 stdext 네임스페이스로 이동되었습니다. 자세한 내용은 stdext 네임스페이스를 참조하십시오.

예제

// hash_map_begin.cpp
// compile with: /EHsc
#include <hash_map>
#include <iostream>

int main( )
{
   using namespace std;
   using namespace stdext;
   hash_map <int, int> hm1;

   hash_map <int, int> :: iterator hm1_Iter;
   hash_map <int, int> :: const_iterator hm1_cIter;
   typedef pair <int, int> Int_Pair;

   hm1.insert ( Int_Pair ( 0, 0 ) );
   hm1.insert ( Int_Pair ( 1, 1 ) );
   hm1.insert ( Int_Pair ( 2, 4 ) );

   hm1_cIter = hm1.begin ( );
   cout << "The first element of hm1 is " 
        << hm1_cIter -> first << "." << endl;
   
   hm1_Iter = hm1.begin ( );
   hm1.erase ( hm1_Iter );

   // The following 2 lines would err because the iterator is const
   // hm1_cIter = hm1.begin ( );
   // hm1.erase ( hm1_cIter );

   hm1_cIter = hm1.begin( );
   cout << "The first element of hm1 is now " 
        << hm1_cIter -> first << "." << endl;
}

요구 사항

헤더: <hash_map>

네임스페이스: stdext

참고 항목

참조

hash_map 클래스

표준 템플릿 라이브러리