hash_map::rend
Returns an iterator that addresses the location succeeding the last element in a reversed hash_map.
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 hash_map (the location that had preceded the first element in the unreversed hash_map).
Remarks
rend is used with a reversed hash_map just as end is used with a hash_map.
If the return value of rend is assigned to a const_reverse_iterator, then the hash_map object cannot be modified. If the return value of rend is assigned to a reverse_iterator, then the hash_map object can be modified.
rend can be used to test to whether a reverse iterator has reached the end of its hash_map.
The value returned by rend should not be dereferenced.
In Visual C++ .NET 2003, members of the <hash_map> and <hash_set> header files are no longer in the std namespace, but rather have been moved into the stdext namespace. See The stdext Namespace for more information.
Example
// hash_map_rend.cpp
// compile with: /EHsc
#define _DEFINE_DEPRECATED_HASH_CLASSES 0
#include <hash_map>
#include <iostream>
int main( )
{
using namespace std;
using namespace stdext;
hash_map <int, int> hm1;
hash_map <int, int> :: iterator hm1_Iter;
hash_map <int, int> :: reverse_iterator hm1_rIter;
hash_map <int, int> :: const_reverse_iterator hm1_crIter;
typedef pair <int, int> Int_Pair;
hm1.insert ( Int_Pair ( 1, 10 ) );
hm1.insert ( Int_Pair ( 2, 20 ) );
hm1.insert ( Int_Pair ( 3, 30 ) );
hm1_rIter = hm1.rend( );
hm1_rIter--;
cout << "The last element of the reversed hash_map hm1 is "
<< hm1_rIter -> first << "." << endl;
// begin can be used to start an iteration
// through a hash_map in a forward order
cout << "The hash_map is: ";
for ( hm1_Iter = hm1.begin( ) ; hm1_Iter != hm1.end( );
hm1_Iter++)
cout << hm1_Iter -> first << " ";
cout << "." << endl;
// rbegin can be used to start an iteration
// through a hash_map in a reverse order
cout << "The reversed hash_map is: ";
for ( hm1_rIter = hm1.rbegin( ) ; hm1_rIter != hm1.rend( );
hm1_rIter++)
cout << hm1_rIter -> first << " ";
cout << "." << endl;
// A hash_map element can be erased by dereferencing to its key
hm1_rIter = --hm1.rend( );
hm1.erase ( hm1_rIter -> first );
hm1_rIter = hm1.rend( );
hm1_rIter--;
cout << "After the erasure, the last element "
<< "in the reversed hash_map is "
<< hm1_rIter -> first << "." << endl;
}
The last element of the reversed hash_map hm1 is 1. The hash_map is: 1 2 3 . The reversed hash_map is: 3 2 1 . After the erasure, the last element in the reversed hash_map is 2.
Requirements
Header: <hash_map>
Namespace: stdext