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Error: "no operator "<<" matches these operands

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  • 28-11-2011 7:04pm
    #1
    i124Q
    Registered Users Posts: 413 ✭✭


    I'm using C++ with allegro(don't think this has any affect on this issue) and Visual Studio 2010.

    Helpp pleeease. So annoying. See pic below.

    shapes.png


Comments

  • Options
    #2
    Colonel Panic
    Registered Users Posts: 2,023 ✭✭✭Colonel Panic


    Did you overload operator << for the Shape class?
    std::ostream& operator<< (std::ostream &out, Shape &shape)
{
   out << "This is a Shape! Yay!!!";
   return out;
}

    You might need to make it a friend of Shape if you want to write out private members.


  • Options
    #3
    Anima
    Registered Users Posts: 3,945 ✭✭✭Anima


    Yeah you need to overload the << operator or make a function and explicitly call it in your loop.

    Also with C++11 you can cut out some of the syntax for iterators by using the auto keyword.

    [PHP]
    for (auto it = s.begin(); it != s.end(); it++) {
    cout << *it << endl;
    }
    [/PHP]


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