multimap::rbegin

返回解决的迭代器已取消的基于的第一个元素。

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已取消的基于的第一个元素或什么是在unreversed基于的最后一个元素。

备注

正 启动 使用基于，rbegin 使用具有是相反的基于。

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

rbegin 可用于通过基于向后重复。

示例

// multimap_rbegin.cpp
// compile with: /EHsc
#include <map>
#include <iostream>

int main( )
{
   using namespace std;
   multimap <int, int> m1;

   multimap <int, int> :: iterator m1_Iter;
   multimap <int, int> :: reverse_iterator m1_rIter;
   multimap <int, int> :: const_reverse_iterator m1_crIter;
   typedef pair <int, int> Int_Pair;

   m1.insert ( Int_Pair ( 1, 10 ) );
   m1.insert ( Int_Pair ( 2, 20 ) );
   m1.insert ( Int_Pair ( 3, 30 ) );

   m1_rIter = m1.rbegin( );
   cout << "The first element of the reversed multimap m1 is "
        << m1_rIter -> first << "." << endl;

   // begin can be used to start an iteration 
   // throught a multimap in a forward order
   cout << "The multimap is: ";
   for ( m1_Iter = m1.begin( ) ; m1_Iter != m1.end( ); m1_Iter++)
      cout << m1_Iter -> first << " ";
      cout << "." << endl;

   // rbegin can be used to start an iteration 
   // throught a multimap in a reverse order
   cout << "The reversed multimap is: ";
   for ( m1_rIter = m1.rbegin( ) ; m1_rIter != m1.rend( ); m1_rIter++)
      cout << m1_rIter -> first << " ";
      cout << "." << endl;

   // A multimap element can be erased by dereferencing its key 
   m1_rIter = m1.rbegin( );
   m1.erase ( m1_rIter -> first );

   m1_rIter = m1.rbegin( );
   cout << "After the erasure, the first element "
        << "in the reversed multimap is "
        << m1_rIter -> first << "." << endl;
}

要求

标头: <map>

命名空间: std

请参见

参考

multimap Class

标准模板库