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Tip of the Day
Language: C++
Expertise: All
Mar 23, 2000

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The reverse() Algorithm

Another useful STL algorithm is reverse(). This algorithm reverses the order of elements in a specified sequence. reverse() takes two iterators that mark the sequence's beginning and end, respectively. Here is an example of reversing the order of a char array:

 
  #include <algorithm>
  #include <vector>
  using namespace std;
  int main()
  {
    char arr[4] = {'a','b','c','d'};
    reverse(arr, arr+4);  // arr is now "dcba"
  }

Remember that the second argument of reverse() must point one element past the array's bounds. Here's an example of applying reverse() to a vector object:

 
  int main()
  {
    char arr[]= {'a','b','c','d'};
    vector <char> vc (arr, arr+4); // initialize vc
    reverse(vc.begin(), vc.end());
  }
Danny Kalev
 
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