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list::rbegin

Returns an iterator that addresses the first element in a reversed list.

const_reverse_iterator rbegin( ) const; 
reverse_iterator rbegin( );

A reverse bidirectional iterator addressing the first element in a reversed list (or addressing what had been the last element in the unreversed list).

rbegin is used with a reversed list just as begin is used with a list.

If the return value of rbegin is assigned to a const_reverse_iterator, the list object cannot be modified. If the return value of rbegin is assigned to a reverse_iterator, the list object can be modified.

rbegin can be used to iterate through a list backwards.

// list_rbegin.cpp
// compile with: /EHsc
#include <list>
#include <iostream>

int main( ) 
{
   using namespace std;
   list <int> c1;
   list <int>::iterator c1_Iter;
   list <int>::reverse_iterator c1_rIter;

   // If the following line replaced the line above, *c1_rIter = 40;
   // (below) would be an error
   //list <int>::const_reverse_iterator c1_rIter;
   
   c1.push_back( 10 );
   c1.push_back( 20 );
   c1.push_back( 30 );
   c1_rIter = c1.rbegin( );
   cout << "The last element in the list is " << *c1_rIter << "." << endl;

   cout << "The list is:";
   for ( c1_Iter = c1.begin( ); c1_Iter != c1.end( ); c1_Iter++ )
      cout << " " << *c1_Iter;
   cout << endl;

   // rbegin can be used to start an iteration through a list in 
   // reverse order
   cout << "The reversed list is:";
   for ( c1_rIter = c1.rbegin( ); c1_rIter != c1.rend( ); c1_rIter++ )
      cout << " " << *c1_rIter;
   cout << endl;

   c1_rIter = c1.rbegin( );
   *c1_rIter = 40;
   cout << "The last element in the list is now " << *c1_rIter << "." << endl;
}
The last element in the list is 30.
The list is: 10 20 30
The reversed list is: 30 20 10
The last element in the list is now 40.

Header: <list>

Namespace: std

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