Description : It rotates the order of the elements in the range [first,last], in such a way that the element pointed by middle becomes the new first element.
Example :
int main(){
std::vector<int> vec1{1, 2, 3, 4, 5};
// Printing initial elements of vector: 1 2 3 4 5
std::cout << "Old vector :";
for (int i = 0; i < vec1.size(); ++i)
std::cout << " " << vec1[i];
std::cout << "\n";
// Rotate vector left 3 times.
int left = 3;
// Function call to rotate elements of vector in left direction
std::rotate(vec1.begin(), vec1.begin() + left, vec1.end());
// Print elements of vector after rotation: 4 5 1 2 3
std::cout << "New vector after left rotation :";
for (int i = 0; i < vec1.size(); i++)
std::cout << " " << vec1[i];
std::cout << "\n";
std::vector<int> vec2{1, 2, 3, 4, 5};
// Print old vector 1 2 3 4 5
std::cout << "Old vector :";
for (int i = 0; i < vec2.size(); i++)
std::cout << " " << vec2[i];
std::cout << "\n";
// Rotate vector right 4 times.
int right = 4;
// Function call to rotate elements of vector in right direction
std::rotate(vec2.begin(), vec2.begin() + vec2.size() - right, vec2.end());
// Printing elements of vector after rotation: 2 3 4 5 1
std::cout << "New vector after right rotation :";
for (int i = 0; i < vec2.size(); i++)
std::cout << " " << vec2[i];
std::cout << "\n";
return 0;
}