fig20_01.cpp

// fig20_01.cpp
// Demonstrating const_cast.
#include <cctype> // contains prototype for function toupper
#include <iostream>
#include <string>

// returns the larger of two strings
const std::string& maximum(
   const std::string& first, const std::string& second) {
   return (first > second ? first : second);
}

int main() {
   std::string s1{"hello"}; // non-const string
   std::string s2{"goodbye"}; // non-const string

   // const_cast required to allow the const reference returned by 
   // maximum to be assigned to the std::string reference max
   std::string& max{const_cast<std::string&>(maximum(s1, s2))};

   std::cout << "The larger string is: " << max << "\n";

   for (char& character : max) {
      character = std::toupper(character);
   }

   std::cout << "The larger string capitalized is: " << max << "\n";
}


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