Define friend function for <<

  
#include <iostream>
#include <cstring>
#include <cstdlib>
using namespace std;

class StringClass {
  char *p;
  int len;
public:
  StringClass(char *ptr);
  ~StringClass() {
     delete [] p;
  }
  friend ostream &operator<<(ostream &stream, StringClass &ob);
};

StringClass::StringClass(char *ptr)
{
  len = strlen(ptr)+1;
  p = new char [len];
  if(!p) {
    cout << "Allocation error\n";
    exit(1);
  }
  strcpy(p, ptr);
}

ostream &operator<<(ostream &stream, StringClass &ob)
{
  stream << ob.p;
  
  return stream;
}

int main()
{
  StringClass stringObject1("www.java2s.com"), stringObject2("www.java2s.com");

  cout << stringObject1;
  cout << endl << stringObject2 << endl;

  return 0;
}

Related examples in the same category

1.	Friend function Demo
2.	Make the inserter into a friend function
3.	friend class for each other
4.	Friends can access private members of a class.
5.	Use friend function to access the non-public member variable

Define friend function for << : Friend « Class « C++

Related examples in the same category