reverse_copy

Article
07/29/2015

Reverses the order of the elements within a source range while copying them into a destination range

template<class BidirectionalIterator, class OutputIterator> 
   OutputIterator reverse_copy( 
      BidirectionalIterator _First,  
      BidirectionalIterator _Last,  
      OutputIterator _Result 
   );

Parameters

_First
A bidirectional iterator pointing to the position of the first element in the source range within which the elements are being permuted.
_Last
A bidirectional iterator pointing to the position one past the final element in the source range within which the elements are being permuted.
_Result
An output iterator pointing to the position of the first element in the destination range to which elements are being copied.

Return Value

An output iterator pointing to the position one past the final element in the destination range to where the altered sequence of elements is being copied.

Remarks

The source and destination ranges referenced must be valid; all pointers must be dereferenceable and within the sequence the last position is reachable from the first by incrementation.

reverse_copy has two related forms:

For information on how these functions behave, see Checked Iterators.

Example

// alg_reverse_copy.cpp
// compile with: /EHsc
#include <vector>
#include <algorithm>
#include <iostream>

int main( ) {
   using namespace std;
   vector <int> v1, v2( 10 );
   vector <int>::iterator Iter1, Iter2;

   int i;
   for ( i = 0 ; i <= 9 ; i++ )
   {
      v1.push_back( i );
   }

   cout << "The original vector v1 is:\n ( " ;
   for ( Iter1 = v1.begin( ) ; Iter1 != v1.end( ) ; Iter1++ )
      cout << *Iter1 << " ";
   cout << ")." << endl;

   // Reverse the elements in the vector 
   reverse_copy (v1.begin( ), v1.end( ), v2.begin( ) );

   cout << "The copy v2 of the reversed vector v1 is:\n ( " ;
   for ( Iter2 = v2.begin( ) ; Iter2 != v2.end( ) ; Iter2++ )
      cout << *Iter2 << " ";
   cout << ")." << endl;

   cout << "The original vector v1 remains unmodified as:\n ( " ;
   for ( Iter1 = v1.begin( ) ; Iter1 != v1.end( ) ; Iter1++ )
      cout << *Iter1 << " ";
   cout << ")." << endl;
}

Output

The original vector v1 is:
 ( 0 1 2 3 4 5 6 7 8 9 ).
The copy v2 of the reversed vector v1 is:
 ( 9 8 7 6 5 4 3 2 1 0 ).
The original vector v1 remains unmodified as:
 ( 0 1 2 3 4 5 6 7 8 9 ).

Requirements

Header: <algorithm>

Namespace: std

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