C++ examples for Class:Operator Overload
Convert between ordinary strings and class String
#include <iostream> using namespace std; #include <string.h> //for strcpy(), etc. class String //user-defined string type { private:/*from www. ja v a 2 s.com*/ enum { SZ = 80 }; //size of all String objects char str[SZ]; //holds a C-string public: String() //no-arg constructor { str[0] = '\0'; } String( char s[] ) //1-arg constructor { strcpy(str, s); } // convert C-string to String void display() const { cout << str; } operator char*() //conversion operator { return str; } //convert String to C-string }; int main() { String s1; //use no-arg constructor char xstr[] = "Joyeux Noel! "; s1 = xstr; //use 1-arg constructor // to convert C-string to String s1.display(); String s2 = "Bonne Annee!"; //uses 1-arg constructor to initialize String cout << static_cast<char*>(s2); //use conversion operator cout << endl; //to convert String to C-string return 0; //before sending to << op }