hash_map::get_allocator

注意事項
這個 API 已經過時。這個選項是 unordered_map Class。

傳回用來配置器物件複本建構 hash_map。

Allocator get_allocator( ) const;

傳回值

使用 hash_map 的配置器。

備註

hash_map 類別的配置器指定類別如何處理儲存區。 預設配置器提供 STL 容器類別的大部分程式的需求就已足夠。 撰寫和使用的配置器類別是進階 C++ 主題。

在 Visual C++ .NET Pocket PC， <hash_map> 和 <hash_set> 標頭檔 (Header File) 的成員不在 std 命名空間，，而是移至 stdext 命名空間。 如需詳細資訊，請參閱 stdext 命名空間。

範例

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

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

   // The following lines declare objects
   // that use the default allocator.
   hash_map <int, int> hm1;
   hash_map <int, int> hm2;
   hash_map <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_map hm4
   // with the allocator of hash_map hm1.
   hash_map <int, int> hm4( less<int>( ), hm1_Alloc );

   hm4_Alloc = hm4.get_allocator( );

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

範例輸出

下列輸出是 x86。

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.

需求

標題: <hash_map>

命名空間: stdext

請參閱

參考

hash_map Class

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