C++ operator overloading problem

[abnair]

I am trying out operator overloading. I have following code:

class Mystring{
   public:
      Mystring(char* ch)
      {
         data = new char[strlen(ch)*4];
         strcpy(data,ch);
      }
      friend Mystring operator+(Mystring& s1, Mystring& s2);
      friend ostream& operator<<(ostream& out, Mystring& s1);
   char *data;
};
Mystring operator+( Mystring& s1, Mystring& s2)
{
   Mystring temp(s1.data);
   strcat(temp.data,s2.data);
   return temp;
}
ostream& operator<<(ostream& out, Mystring& s1)
{
   out<<s1.data;
   return out;
}

In main I have defined two Mystring object.

Mystring s1("Abhilash");
Mystring s2("Nair");

Following two statements work fine.

Mystring s3=s1+s2;
cout<<s3<<endl;

But when I do

cout<<s1+s2<<endl;

I get compiler error. I am using cygwin compiler.

Below is the error I get. Why do you think it is happening?

[Banfa]

Actually giving the error you got would make this easier to diagnose however you could try

cout<<(s1+s2)<< endl;