Operator overloading trouble

I can't seem to understand whats wrong with my program. I keep getting this linker error.

Code:

error LNK2019: unresolved external symbol "class std::basic_ostream<char,struct std::char_traits<char> > & __cdecl operator
<<(class std::basic_ostream<char,struct std::char_traits<char> > &,class Bid_Class &)" (??6@YAAAV?$basic_ostream@DU?$ch
ar_traits@D@std@@@std@@AAV01@AAVBid_Class@@@Z) referenced in function "class std::basic_ostream<char,struct std::ch
ar_traits<char> > & __cdecl operator<<(class std::basic_ostream<char,struct std::char_traits<char> > &,
class Item_Class const &)" (??6@YAAAV?$basic_ostream@DU?$char_traits@D@std@@@std@@AAV01@ABVItem_Class@@@Z)

Code:

//Private
Bid_Class *bidPointer;
//Public
Bid_Class * getPointer() const { return bidPointer;}

ostream& operator<< (ostream &out,const Item_Class& obj)
{
	Bid_Class *tempPointer=obj.getPointer();
	out<<obj.getName()<<" ("<<obj.getID()<<")"<<endl;
	if(obj.getBids()==0)
	{
		out<<"    *** No Current Bids ***"<<endl;
	}
	else
	{
		for(int i=0;i<obj.getBids();i++)
		{
///////////////////////////////////////////////////////////////////////////////////////////////////

			out<<tempPointer[i];//This is the part that is giving me the linking errors

//////////////////////////////////////////////////////////////////////////////////////////////////

		}
	}
	return out;
}

//The operator that's being called.

ostream& operator<<(ostream &out, const Bid_Class& obj)
{
	out<<"    --- "<<obj.bidDate.getMonth()<<'/'<<obj.bidDate.getDay()<<'/'<<obj.bidDate.getYear()<<' '<<obj.biddersName<<' '<<obj.amount;
	return out;
}

This should work, but I keep getting some errors. Can anyone help?

Looks like it's trying to reference a version of the overloaded stream operator whose 2nd parameter is class Bid_Class & and not class Bid_Class const &. So I think you are having issues with const and the compiler trying to link a different overloaded function than you think. Try declaring tempPointer as const.

Another possibility is that there is an ostream<<(ostream &, Bid_Class &obj) declared somewhere - note the missing const - but not implemented. Effectively that would mean you have told the compiler such a function exists (so the code compiles) and then the linker detects that you have lied.

It is usually a good idea to provide small but complete samples of code that illustrate your concern. When you paraphrase your problem ("I think it's here, so that's all I show") it is easy to eliminate something relevant.

Once I added const in front of the temporary pointer it suddenly started to work so thanks for the help.