rotate (STL Samples)
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
)
Remarks
Note
The class/parameter names in the prototype do not match the version in the header file. Some have been modified to improve readability.
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>