C++ operator >> overloading

Question

I have a customer class as following,

#include <iostream> #include <vector> #include <string> #include <sstream> #include "SimpleDate.h" using namespace std; class Customer { private: string customerId; string name; string address; string city; string postCode; SimpleDate* dateLastPurchased; double dollarsOwed; public: //Customer(string customerIdVal, string nameVal); Customer(); string getCustomerId(); string getName(); void setAddress(string addressVal); string getAddress(); void setPostCode(string postCodeVal); string getPostCode(); void setCity(string cityVal); string getCity(); void setDateLastPurchased(SimpleDate* date); SimpleDate* getDateLastPurchased(); void addDollarsOwed(double amount); double getDollarsOwed(); friend ostream& operator<< (ostream &out, Customer &cust); friend istream& operator>> (istream &in, Customer &cust); };

Overloading sections in the cpp file looks as following

ostream& operator<< (ostream &out, Customer &cust) { out << cust.customerId << "\t" << cust.name << "\t" << cust.address << "\t" << cust.city << "\t" << cust.postCode << "\t" << cust.dateLastPurchased->getFullDate() << "\t" << cust.dollarsOwed << "\t" << std::endl; return out; } istream& operator>> (istream &in, Customer &cust) { in >> cust.customerId; in >> cust.name; in >> cust.address; in >> cust.city; in >> cust.postCode; string stringData; in >> stringData; std::istringstream iss(stringData); std::string datePart; int tmp; vector<int> dateData; while(std::getline(iss, datePart, '/')) { sscanf(datePart.c_str(), "%d", &tmp); dateData.push_back(tmp); } SimpleDate* date = new SimpleDate(dateData[2], dateData[1], dateData[0]); cust.dateLastPurchased = date; string stringDollarsOwed; in >> stringDollarsOwed; sscanf(stringDollarsOwed.c_str(), "%lf", &cust.dollarsOwed); return in; }

Then in my main class I try to create a customer object as following,

Customer* cust = new Customer(); cust << customerInfo[0] << customerInfo[1] << customerInfo[2] << customerInfo[3] << customerInfo[4] << customerInfo[5] << customerInfo[6];

But when I'm compiling I get the following error,

can you please help?

Thanks.

AppManager.cpp: In member function 'Customer* AppManager::createCustomerObject(std::vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > >)': AppManager.cpp:445: error: no match for 'operator<<' in '& cust << customerInfo.std::vector<_Tp, _Alloc>::operator[] [with _Tp = std::basic_string<char, std::char_traits<char>, std::allocator<char> >, _Alloc = std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >](0u)' Customer.h:46: note: candidates are: std::ostream& operator<<(std::ostream&, Customer&) *** Error code 1 make: Fatal error: Command failed for target `Tour'

You've shown operator>>, but the error message is about operator<<. You've defined ostream &operator<<(ostream &, Customer &). You normally want Customer const & instead. — Jerry Coffin
– Jerry Coffin, Commented Oct 16, 2013 at 5:24

juanchopanza · Accepted Answer · 2013-10-16 05:30:54Z

This operator:

ostream& operator<< (ostream &out, Customer &cust)

allows you do do things like

Customer c; std::cout << c << std::endl; std::ofstream output("customers.txt"); output << c << std::endl;

and not

Customer c; c << x;

and definitely not

Customer* c = ...; c << x;

I'm trying to set the properties of the customer, customerInfo[0] is a string value

AquaAsh · Accepted Answer · 2013-10-16 05:22:06Z

0

You seem to be inserting the customerInfo[0] etc objects into the cust object that you have created. You cannot insert one object into another like that. The insertion/extraction operator as they are overloaded can only be used with as they are with primitive datatypes, i.e. storing and displaying values in the objects.

answered Oct 16, 2013 at 5:22

AquaAsh

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3 Comments

Achintha Gunasekara Over a year ago

I'm trying to set the properties of the customer, customerInfo[0] is a string value

AquaAsh Over a year ago

If you want to read the values from the string into the object then you need to write a separate function, that can parse the string (may be your string is ',', '-', '_' etc delimited)and populate the fields of the object.

Achintha Gunasekara Over a year ago

I have a function that already does that :) customerInfo is a vector of string values, I'm trying to set them in the object using >>.

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