reverse

Reverses the order of the elements within a range.

``````template<class BidirectionalIterator>
void reverse(
BidirectionalIterator _First,
BidirectionalIterator _Last
);
``````

Parameters

• _First
A bidirectional iterator pointing to the position of the first element in the range within which the elements are being permuted.

• _Last
A bidirectional iterator pointing to the position one past the final element in the range within which the elements are being permuted.

Remarks

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

Example

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

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

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 (v1.begin( ), v1.end( ) );

cout << "The modified vector v1 with values reversed is:\n ( " ;
for ( Iter1 = v1.begin( ) ; Iter1 != v1.end( ) ; Iter1++ )
cout << *Iter1 << " ";
cout << ")." << endl;
}
``````
```The original vector v1 is:
( 0 1 2 3 4 5 6 7 8 9 ).
The modified vector v1 with values reversed is:
( 9 8 7 6 5 4 3 2 1 0 ).```

Namespace: std