std::reverse_copy

 

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Template:ddcl list begin <tr class="t-dsc-header">

<td>

Defined in header <algorithm>

</td>

<td></td> <td></td> </tr> <tr class="t-dcl ">

<td class="t-dcl-nopad">

template< class BidirectionalIterator, class OutputIt >
OutputIt reverse_copy( BidirectionalIterator first, BidirectionalIterator last, OutputIt d_first );

</td>

<td class="t-dcl-nopad"> </td> <td class="t-dcl-nopad"> </td> </tr> Template:ddcl list end

Copies the elements from the range [first, last), to another range beginning at d_first in such a way, that the elements in the new range are in reverse order.

Parameters

first, last	-	the range of elements to copy
d_first	-	the beginning of the destination range

Return value

output iterator to the element past the last element copied.

Possible implementation

template<class BidirectionalIterator, class OutputIt> OutputIt reverse_copy(BidirectionalIterator first, BidirectionalIterator last, OutputIt d_first) { while (first != last) { *(d_first++) = *(--last); } return d_first; }

Example

Run this code

#include <vector>
#include <iostream>
#include <algorithm>
 
int main()
{
    std::vector<int> v({1,2,3});
    std::for_each(std::begin(v), std::end(v),
                  [&](int value){ std::cout << value << " "; });
    std::cout << std::endl;
 
    std::vector<int> destiny(3);
    std::reverse_copy(std::begin(v), std::end(v), std::begin(destiny));
    std::for_each(std::begin(destiny), std::end(destiny),
                  [&](int value){ std::cout << value << " "; });
    std::cout << std::endl;
}

Output:

1 2 3 
3 2 1

Complexity

linear in the distance between first and last

See also

Template:cpp/algorithm/dcl list reverse