hash_multimap::get_allocator

참고

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

Returns a copy of the allocator object used to construct the hash_multimap.

Allocator get_allocator( ) const;

반환 값

The allocator used by the hash_multimap.

설명

Allocators for the hash_multimap class specify how the class manages storage. The default allocators supplied with STL container classes is sufficient for most programming needs. Writing and using your own allocator class is an advanced C++ topic.

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

int main( )
{
   using namespace std;
   using namespace stdext;
   hash_multimap <int, int>::allocator_type hm1_Alloc;
   hash_multimap <int, int>::allocator_type hm2_Alloc;
   hash_multimap <int, double>::allocator_type hm3_Alloc;
   hash_multimap <int, int>::allocator_type hm4_Alloc;

   // The following lines declare objects
   // that use the default allocator.
   hash_multimap <int, int> hm1;
   hash_multimap <int, int> hm2;
   hash_multimap <int, double> hm3;

   hm1_Alloc = hm1.get_allocator( );
   hm2_Alloc = hm2.get_allocator( );
   hm3_Alloc = hm3.get_allocator( );

   cout << "The number of integers that can be allocated"
        << endl << " before free memory is exhausted: "
        << hm2.max_size( ) << "." << endl;

   cout << "The number of doubles that can be allocated"
        << endl << " before free memory is exhausted: "
        << hm3.max_size( ) <<  "." << endl;

   // The following line creates a hash_multimap hm4
   // with the allocator of hash_multimap hm1.
   hash_multimap <int, int> hm4( less<int>( ), hm1_Alloc );

   hm4_Alloc = hm4.get_allocator( );

   // Two allocators are interchangeable if
   // storage allocated from each can be
   // deallocated by the other
   if( hm1_Alloc == hm4_Alloc )   
   {
      cout << "The allocators are interchangeable."
           << endl;   
   }
   else   
   {
      cout << "The allocators are not interchangeable."
           << endl;
   }
}

샘플 출력

x86으로 다음 출력이 생성됩니다.

The number of integers that can be allocated
 before free memory is exhausted: 536870911.
The number of doubles that can be allocated
 before free memory is exhausted: 268435455.
The allocators are interchangeable.

요구 사항

헤더: <hash_map>

네임스페이스: stdext

참고 항목

참조

hash_multimap 클래스

표준 템플릿 라이브러리