c-resources/CPlusPlus20ForProgrammers-m.../examples/ch20/fig20_01.cpp

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// 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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