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rotate

Illustrates how to use the rotate Standard Template Library (STL) function in Visual C++.

template<class ForwardIterator> inline
   void rotate(
      ForwardIterator First,
      ForwardIterator Middle,
      ForwardIterator Last
   )
Note   The class/parameter names in the prototype do not match the version in the header file. Some have been modified to improve readability.

Remarks

The rotate algorithm rotates the elements in the range [First, Last) to the right by n positions, where n = Middle - First.

Example

// rotate.cpp
// compile with: /EHsc
// Illustrates how to use the rotate function.
//
// Functions:
//    rotate - Rotate the items in a sequence by n positions.
//
//////////////////////////////////////////////////////////////////////

// disable warning C4786: symbol greater than 255 character,
// okay to ignore
#pragma warning(disable: 4786)

#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <functional>

using namespace std;

int main()
{
   const int VECTOR_SIZE = 8;

   // Define a template class vector of strings
   typedef vector<string> StrVector;

   //Define an iterator for template class vector of strings
   typedef StrVector::iterator StrVectorIt;

   StrVector Tongue_Twister(VECTOR_SIZE);

   StrVectorIt start, end, middle, it;

   // location of first element of Tongue_Twister
   start = Tongue_Twister.begin();   

   // one past the location last element of Tongue_Twister
   end = Tongue_Twister.end();       


   // Initialize vector Tongue_Twister
   Tongue_Twister[0] = "she";
   Tongue_Twister[1] = "sells";
   Tongue_Twister[2] = "sea";
   Tongue_Twister[3] = "shells";
   Tongue_Twister[4] = "by";
   Tongue_Twister[5] = "the";
   Tongue_Twister[6] = "sea";
   Tongue_Twister[7] = "shore";

   middle = start + 3;  // start position for rotating elements

   cout << "Before calling rotate" << endl;

   // print content of Tongue_Twister
   cout << "Try this Tongue Twister:";
   for (it = start; it != end; it++)
      cout << " " << *it;

   // rotate the items in the vector Tongue_Twister by 3 positions
   rotate(start, middle, end);

   cout << endl << "After calling rotate" << endl;

   // print content of Tongue_Twister
   cout << "Now try the rotated Tongue Twister:";
   for (it = start; it != end; it++)
      cout << " " << *it;
   cout << endl;
}

Output

Before calling rotate
Try this Tongue Twister: she sells sea shells by the sea shore
After calling rotate
Now try the rotated Tongue Twister: shells by the sea shore she sells sea

Requirements

Header: <algorithm>

See Also

Standard Template Library Samples

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