Rotate a string in c++?

Question

I\'m looking for a way to rotate a string in c++. I spend all of my time in python, so my c++ is very rusty.

Here is what I want it to do: if I have a strin

Answer 1

There is a standard rotate function found in the algorithm header.
If you want to do this yourself, you could try the following:

#include 
#include 

std::string rotate_string( std::string s ) {
    if (s.empty()) return s;

    char first = s[0];

    s.assign(s, 1, s.size() - 1);
    s.append(1, first);

    return s;
}

int main() {
    std::string foo("abcde");

    std::cout << foo << "\t" << rotate_string(foo) <<  std::endl;

    return 0;
}

But of course, using the standard library is preferable here, and in most cases.

EDIT #1 I just saw litb's answer. Beat again!
EDIT #2 I just want to mention that the rotate_string function fails on strings of 0 length. You will get a std::out_of_range error. You can remedy this with a simple try/catch block, or use std::rotate :-)
EDIT #3 Return the same string if the length of the string is 0.