hash_multimap::rbegin

说明说明

此 API 已过时。另一种方法是 unordered_multimap Class

返回解决的迭代器已取消的 hash_multimap 的第一个元素。

const_reverse_iterator rbegin( ) const; 
reverse_iterator rbegin( );

返回值

解决活动反向双向的迭代器解决在一是相反的 hash_multimap 的第一个元素或什么是在 unreversed hash_multimap 的最后一个元素。

备注

启动 使用 hash_multimap,rbegin 使用具有是相反的 hash_multimap。

如果 rbegin 的返回值赋给 const_reverse_iterator,则不能修改 hash_multimap 对象。如果 rbegin 的返回值赋给 reverse_iterator,则可以修改 hash_multimap 对象。

rbegin 可用于通过 hash_multimap 向后重复。

在 Visual C++ .NET 2003 中,<hash_map><hash_set> 标头文件的成员中不再标准,命名空间,而是将 stdext 命名空间。有关更多信息,请参见 stdext 命名空间

示例

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

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

   hash_multimap <int, int> :: iterator hm1_Iter;
   hash_multimap <int, int> :: reverse_iterator hm1_rIter;
   hash_multimap <int, int> :: const_reverse_iterator hm1_crIter;
   typedef pair <int, int> Int_Pair;

   hm1.insert ( Int_Pair ( 1, 10 ) );
   hm1.insert ( Int_Pair ( 2, 20 ) );
   hm1.insert ( Int_Pair ( 3, 30 ) );

   hm1_rIter = hm1.rbegin( );
   cout << "The first element of the reversed hash_multimap hm1 is "
        << hm1_rIter -> first << "." << endl;

   // begin can be used to start an iteration 
   // through a hash_multimap in a forward order
   cout << "The hash_multimap is: ";
   for ( hm1_Iter = hm1.begin( ) ; hm1_Iter != hm1.end( ); hm1_Iter++)
      cout << hm1_Iter -> first << " ";
      cout << "." << endl;

   // rbegin can be used to start an iteration 
   // through a hash_multimap in a reverse order
   cout << "The reversed hash_multimap is: ";
   for ( hm1_rIter = hm1.rbegin( ) ; hm1_rIter != hm1.rend( ); hm1_rIter++)
      cout << hm1_rIter -> first << " ";
      cout << "." << endl;

   // A hash_multimap element can be erased by dereferencing its key 
   hm1_rIter = hm1.rbegin( );
   hm1.erase ( hm1_rIter -> first );

   hm1_rIter = hm1.rbegin( );
   cout << "After the erasure, the first element"
        << "\n in the reversed hash_multimap is "
        << hm1_rIter -> first << "." << endl;
}
  
  
  
  

要求

标头: <hash_map>

命名空间: stdext

请参见

参考

hash_multimap Class

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