CS202
6- ‹#›
Overloading +, += Operators
class string {
public:
explicit string (char *); //another constructor
friend string operator + (const string
&, char *);
friend string operator + (char *, const
string &);
friend string operator + (const
string&, const string&);
string & operator += (const string
&);
string & operator += (char *);
•••
};
string operator + (const
string &s,const string &s2) {
char * temp = new
char[s.len+s2.len+1];
strcpy(temp, s.str);
strcat(temp, s2.str);
return string(temp); //makes a temporary object
}
string &
string::operator += (const string & s2) {
len += s2.len;
char * temp = new char[len+s2.len+1];
strcpy(temp, str);
strcat(temp, s2.str);
str = temp; //copy over the pointer
return *this; //just copying an address
}