ostream<< overloading for bookinventory program

This is a discussion on ostream<< overloading for bookinventory program within the C++ Programming forums, part of the General Programming Boards category; I am getting an error in my << overloaded function of my book class that I do not understand here ...

  1. #1
    Registered User
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    Jul 2003
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    450

    ostream<< overloading for bookinventory program

    I am getting an error in my << overloaded function of my book class that I do not understand here is some code snippits:
    Code:
    void Book::printAuthors(const vector<Author> & tempauthors){
        vector<Author>::const_iterator constIterator;
        
        for (constIterator=tempauthors.begin();
             constIterator!=tempauthors.end();
             ++constIterator)
             cout << *constIterator<<endl;
    }
    
    ostream &operator<<(ostream & os,const Book & tBook){
        os << "\nTitle: "<<tBook.get_title()<<'\n';
        os << "Publisher: "<<tBook.get_publisher()<<'\n';
        os << "Authors: "<<'\n';
        tBook.printAuthors(tBook.authors);
        
        os << endl;
        return os;
    }
    the errors:
    ook.cpp: In function `std::ostream& operator<<(std::ostream&, const Book&)':
    book.cpp:90: passing `const Book' as `this' argument of `void
    Book::printAuthors(const std::vector<Author, std::allocator<Author> >&)'
    discards qualifiers

  2. #2
    Registered User
    Join Date
    May 2003
    Posts
    161
    You're calling a non-const method on a const object. Change your printAuthors method to:

    Code:
    void Book::printAuthors(const vector<Author> & tempauthors) const {

  3. #3
    Registered User
    Join Date
    Jul 2003
    Posts
    450
    thanks for the input that fixed the problem

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