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reverse_copy
Copies the elements while reversing their order
Definition
The reverse_copy() algorithm is defined in the standard header <algorithm> and in the nonstandard backward-compatibility header <algo.h>.Interface
template < class BidirectionalIterator, class OutputIterator > OutputIterator reverse_copy( BidirectionalIterator first, BidirectionalIterator last, OutputIterator result );Parameters:
| Parameter | Description |
|---|---|
| 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 |
Description
Reverse_copy copies the elements from the range[first, last), to another range beginning at result in such a way, that the elements in the new range are in reverse order.Example:
Example - reverse_copy algorithm
Problem
This program illustrates the functionality of reverse_copy() algorithm.
Workings
#include <vector> #include <algorithm> #include <iostream> using namespace std; int main() { vector <int> vec1, vec2(11); vector <int>::iterator Iter1, Iter2; int i; for (i = 10; i <= 20; i++) vec1.push_back(i); cout <<"The original vector vec1 data is:\n"; for (Iter1 = vec1.begin(); Iter1 != vec1.end(); Iter1++) cout <<*Iter1<<" "; cout <<endl; // reverse the elements in the vector reverse_copy(vec1.begin(), vec1.end(), vec2.begin()); cout <<"The copy vec2 data of the reversed vector vec1 is:\n"; for (Iter2 = vec2.begin(); Iter2 != vec2.end(); Iter2++) cout <<*Iter2<<" "; cout <<endl; cout <<"The original vector vec1 unmodified as:\n"; for (Iter1 = vec1.begin(); Iter1 != vec1.end(); Iter1++) cout <<*Iter1<<" "; cout <<endl; return 0; }
Solution
Output:
The original vector vec1 data is:
10 11 12 13 14 15 16 17 18 19 20
The copy vec2 data of the reversed vector vec1 is:
20 19 18 17 16 15 14 13 12 11 10
The original vector vec1 unmodified as:
10 11 12 13 14 15 16 17 18 19 20
10 11 12 13 14 15 16 17 18 19 20
The copy vec2 data of the reversed vector vec1 is:
20 19 18 17 16 15 14 13 12 11 10
The original vector vec1 unmodified as:
10 11 12 13 14 15 16 17 18 19 20
References
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