CODEWITHSUNDEEP
c++pointersdereference
turing042
turing042

Reputation: 99

Dereferencing vector pointers with a range based for loop

This is the code from my main() function:

std::map<int, std::string> candyMap;
std::vector<House*> houseVector;
std::ifstream abodeFile{houseFile};
std::string houseLine;
if(abodeFile.is_open())
{
    while(getline(abodeFile, houseLine))
    {
        houseVector.push_back(new House(houseLine, candyMap));
    }
}

std::cout << std::setw(11) << " ";
for(auto i:houseVector)
{
    std::cout << std::setw(11) << i;
}

I am trying to print out the elements from houseVector. Obviously, with the above code I get the addresses of the elements. When I do *i, I get an operator error with <<. What is the correct way to dereference here?

Upvotes: 1

Views: 238

Answers (1)

Oblivion
Oblivion

Reputation: 7374

you need to overload ostream << operator, e.g.:

class House
{
    int member;
public:
    explicit House (int i) : member(i) {}
    friend ostream& operator<<(ostream& os, const House& house);
};

ostream& operator<<(ostream& os, const House& house)
{
    os <<house.member << '\n';
    return os;
}

Live on Godbolt

Or without friend:

class House
{
    int member;
public:
    explicit House (int i) : member(i) {}

    std::ostream &write(std::ostream &os) const { 
        os<<member<<'\n';
        return os;
    }
};

std::ostream &operator<<(std::ostream &os, const House& house) { 
     return house.write(os);
}

Live on Godbolt

Upvotes: 2

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