How do you reverse a string in place in C or C++?

Question

How do you reverse a string in C or C++ without requiring a separate buffer to hold the reversed string?

Answer 1

Here is the cleanest, safest, easiest way to reverse a string in C++ (in my opinion):

#include 

void swap(std::string& str, int index1, int index2) {

    char temp = str[index1];
    str[index1] = str[index2];
    str[index2] = temp;

}

void reverse(std::string& str) {

    for (int i = 0; i < str.size() / 2; i++)
        swap(str, i, str.size() - i - 1);

}

An alternative is to use std::swap, but I like defining my own functions - it's an interesting exercise and you don't need to include anything extra.