list::rend
Returns an iterator that addresses the location succeeding the last element in a reversed list.
const_reverse_iterator rend( ) const;
reverse_iterator rend( );
Return Value
A reverse bidirectional iterator that addresses the location succeeding the last element in a reversed list (the location that had preceded the first element in the unreversed list).
Remarks
rend is used with a reversed list just as end is used with a list.
If the return value of rend is assigned to a const_reverse_iterator, the list object cannot be modified. If the return value of rend is assigned to a reverse_iterator, the list object can be modified.
rend can be used to test to whether a reverse iterator has reached the end of its list.
The value returned by rend should not be dereferenced.
Example
// list_rend.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 had replaced the line above, an error would
// have resulted in the line modifying an element (commented below)
// because the iterator would have been const
// list <int>::const_reverse_iterator c1_rIter;
c1.push_back( 10 );
c1.push_back( 20 );
c1.push_back( 30 );
c1_rIter = c1.rend( );
c1_rIter --; // Decrementing a reverse iterator moves it forward in
// the list (to point to the first element here)
cout << "The first 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;
// rend can be used to test if an iteration is through all of the
// elements of a reversed list
cout << "The reversed list is:";
for ( c1_rIter = c1.rbegin( ); c1_rIter != c1.rend( ); c1_rIter++ )
cout << " " << *c1_rIter;
cout << endl;
c1_rIter = c1.rend( );
c1_rIter--; // Decrementing the reverse iterator moves it backward
// in the reversed list (to the last element here)
*c1_rIter = 40; // This modification of the last element would have
// caused an error if a const_reverse iterator had
// been declared (as noted above)
cout << "The modified reversed list is:";
for ( c1_rIter = c1.rbegin( ); c1_rIter != c1.rend( ); c1_rIter++ )
cout << " " << *c1_rIter;
cout << endl;
}
The first element in the list is: 10 The list is: 10 20 30 The reversed list is: 30 20 10 The modified reversed list is: 30 20 40
Requirements
Header: <list>
Namespace: std