reverse_iterator rbegin();
const_reverse_iterator rbegin() const;
Return reverse iterator to reverse beginning
Returns a reverse iterator referring to the last element in the container.
rbegin refers to the element right before the one that would be referred to by member end.
Notice that unlike member deque::back, which returns a reference to this same element, this function returns a reverse random access iterator.
Parameters
none
Return Value
A reverse iterator to the reverse beginning of the sequence.
Both reverse_iterator and const_reverse_iterator are member types. In the deque class template, these are reverse random access iterators, defined as reverse_iterator<iterator> and reverse_iterator<const_iterator> respectively.
Example
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
|
// deque::rbegin/rend
#include <iostream>
#include <deque>
using namespace std;
int main ()
{
deque<int> mydeque;
deque<int>::reverse_iterator rit;
for (int i=1; i<=5; i++) mydeque.push_back(i);
cout << "mydeque contains:";
rit = mydeque.rbegin();
while ( rit < mydeque.rend() )
{
cout << " " << *rit;
++rit;
}
cout << endl;
return 0;
}
|
Notice how the reverse iterator iterates through the deque container in a reverse way by increasing the iterator, and how this is compared against deque::rend in the loop. Output:
mydeque contains: 5 4 3 2 1
|
Complexity
Constant.
See also
| deque::back | Access last element (public member function) |
| deque::rend | Return reverse iterator to reverse end (public member function) |
| deque::begin | Return iterator to beginning (public member function) |
| deque::end | Return iterator to end (public member function) |
|