deque::rend
Returns an iterator that addresses the location succeeding the last element in a reversed deque.
const_reverse_iterator rend( ) const;
reverse_iterator rend( );
Return Value
A reverse random-access iterator that addresses the location succeeding the last element in a reversed deque (the location that had preceded the first element in the unreversed deque).
Remarks
rend is used with a reversed deque just as end is used with a deque.
If the return value of rend is assigned to a const_reverse_iterator, the deque object cannot be modified. If the return value of rend is assigned to a reverse_iterator, the deque object can be modified.
rend can be used to test whether a reverse iterator has reached the end of its deque.
The value returned by rend should not be dereferenced.
Example
// deque_rend.cpp
// compile with: /EHsc
#include <deque>
#include <iostream>
int main( )
{
using namespace std;
deque <int> c1;
deque <int>::iterator c1_Iter;
deque <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
// deque <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 deque (to point to the first element here)
cout << "The first element in the deque is: " << *c1_rIter << endl;
cout << "The deque 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 deque
cout << "The reversed deque 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 deque (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 deque is: ";
for ( c1_rIter = c1.rbegin( ); c1_rIter != c1.rend( ); c1_rIter++ )
cout << *c1_rIter << " ";
cout << endl;
}
Output
The first element in the deque is: 10
The deque is: 10 20 30
The reversed deque is: 30 20 10
The modified reversed deque is: 30 20 40
Requirements
Header: <deque>
Namespace: std