CODEWITHSUNDEEP
c++
Saryk
Saryk

Reputation: 355

Creating a bunch of objects in C++

I have a quite simple situation I don't know how to resolve :
I am parsing a file with addresses (city, street and street number), and have the following class :

class Address
{
  std::string city;
  std::string street;
  std::string number;
};

I would like to create an object for each address I find in the file, but I can't know how many there are since the file can change. Is there a way to create an Array of objects ; or any more suitable solution ?

NOTE : Parser works fine, all there is to do is to set the values in the objects.

Upvotes: 1

Views: 179

Answers (2)

Loki Astari
Loki Astari

Reputation: 264421

Like @Serge but rather than use the parser directly define an input operator.

struct Address
{
  std::string city;
  std::string street;
  std::string number;
  friend std::istream& operator>>(std::istream& in, Address& address) {
      return parseAddress(in, address);
  }
};

std::istream& parseAddress(std::istream& in, Address& address)
{
    //TODO: implement
    //TODO: return stream.
    //          If the parse failed.
    //                Then set the bad bit on the stream.
}
int main()
{
    std::ifstream          file("address.txt");
    std::vector<Address>   addresses(std::istream_iterator<Address>(file),
                                     std::istream_iterator<Address>());
}

Upvotes: 1

Serge Rogatch
Serge Rogatch

Reputation: 15040

You can use std::vector for such purpose: http://en.cppreference.com/w/cpp/container/vector

#include <vector>

struct Address
{
  std::string city;
  std::string street;
  std::string number;
};

bool parseAddress(Address& address)
{
    //TODO: implement
    //TODO: return "true" if another address has been successfully parsed
}

int main()
{
    std::vector<Address> addresses;
    Address current;
    while(parseAddress(current))
    {
        addresses.push_back(current);
    }
    return 0;
}

Upvotes: 4

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