Question

#include <iostream>
#include <string>

using namespace std;

class phonebook
{
    string name;
    string prefix;
public:
    phonebook(string &name, string &prefix)
    {
        this->name = name;
        this->prefix = prefix;
    }

    friend istream &operator>>(istream &in, phonebook &book);
};

istream &phonebook::operator>>(istream &in, phonebook &book)
{
    in >> book.name >> book.prefix;
    return in;
}

int main()
{
    return 0;
}

When I try to compile this code using g++ 4.6.1:

“main.cpp:20: error: ‘std::istream& phonebook::operator>>(std::istream&, phonebook&)’ must take exactly one argument”

PS: It was pretty dumb thing to ask… So obvious :S. Thank you though.

Answer 1

You cannot overload operator >> for streaming as a member function. Any operator that is defined as a member function takes its first argument as a reference to (const) Type, where Type is your class name – in this case, phonebook.

You need to change

istream &phonebook::operator>>(istream &in, phonebook &book)

to

istream & operator>>(istream &in, phonebook &book)