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

With C++ lambda:

 auto reverse = [](std::string& s) -> std::string {
        size_t start = 0, end = s.length() -1;
        char temp;

        while (start < end) {
          temp = s[start];
          s[start++] = s[end];
          s[end--] = temp;
        } 

        return s;
   };