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Old 11-16-2004, 02:32 AM   #1
ashirazi
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Registered: Jul 2004
Posts: 60

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c++ template help


Hi,

Ive been yanking my brains on this stupid error since 6 hrs streight, and I havent reached no where. Can some guru please help me out....? Im sure its something cause I get this freaking referencing error even when eventhing (except the construcor) has been comented.

Thanks guys


Code:
//   BinomialNode.h

#ifndef BINOMIALNODE_H 
#define BINOMIALNODE_H 
        
#include <iostream>
        
template <typename Type>
class BinomialNode {
public:
        BinomialNode( );
}
#endif


Code:
#include "BinomialNode.h"
#include <iostream>

using namespace std;
template BinomialNode<int>;

/*
*       Default Constructor
*       PRE:    none
*       POST:   Instance of BinomialNode with no siblings,
*                       children or parent.
*
*/
template <typename Type>
BinomialNode<Type>::BinomialNode(){
}

Code:
//
//         ERROR MESSAGE
//
g++ -R/util/gnu/lib -Wno-non-template-friend  -g -c Driver.cpp 
g++ -R/util/gnu/lib -Wno-non-template-friend  -g -o Driver Driver.o  
Undefined                       first referenced
 symbol                             in file
BinomialNode<int>::BinomialNode[in-charge]()Driver.o
ld: fatal: Symbol referencing errors. No output written to Driver
collect2: ld returned 1 exit status
gmake: *** [Driver] Error 1
 
Old 11-16-2004, 03:46 AM   #2
kev82
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Registered: Apr 2003
Location: Lancaster, England
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havnt done anything with templates in a while but if i remember right any templated member functions must be in the header file, not the implementation file, im sure someone whos done stuff more recently can either correct or elaborate on that though.
 
Old 11-16-2004, 04:13 AM   #3
rjlee
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Registered: Jul 2004
Distribution: Ubuntu 7.04
Posts: 1,991

Rep: Reputation: 76
This is a linker error, which means that you're using a symbol that you haven't defined.

First of all, in any program, you need one of the following functions; it won't link without exactly one of these:
Code:
int main();
int main(int argc);
int main(int argc, char** argv );
int main(int argc, char** argv, char** envp);
The symbol it's complaining about is the BinomialNode<int>::BinomialNode() constructor; since you haven't used BinomialNode<int> anywhere in your code, it's difficult to see why this error occurs.

You might try moving the implementation to the header file; though I don't recall that limitation myself, there is a thread on it here: http://www.linuxquestions.org/questi...light=template
 
Old 11-16-2004, 08:17 AM   #4
deiussum
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Registered: Aug 2003
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kev82 is correct. Templated classes must be implemented completely in the header file. The link in the response above discusses a bit more on why that is...

Last edited by deiussum; 11-16-2004 at 08:19 AM.
 
Old 11-16-2004, 08:52 AM   #5
ashirazi
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Registered: Jul 2004
Posts: 60

Original Poster
Rep: Reputation: 15
Thanks for the replies guys, I finally got it working. The issue wasnt only the "int main()" thing, but it seems i also had to implement the .cpp file at the end of the header file. Found this tip on one of the websites. Thanks a lot for the replies....
 
  


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