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Oct 8th, 2009
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instances.inc?

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I am trying to compile some code (Example.cpp from here: http://www.rpi.edu/~doriad/Daniweb/maxflow/). I am getting

C++ Syntax (Toggle Plain Text)
  1. Example.cpp:(.text+0x38): undefined reference to `Graph<int, int, int>::Graph(int, int, void (*)(char*))'
  2.  

This is clearly a template instantiation problem. I see that there is a file called instances.inc that defines the <int,int,int> class, do I need to somehow tell gcc/g++ to use this file? Or how else could I get this to work?

Thanks,

Dave
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Re: instances.inc?
Here is a simplified version that produces the error:

graph.h
C++ Syntax (Toggle Plain Text)
  1. #include <string.h>
  2.  
  3.  
  4. template <typename captype, typename tcaptype, typename flowtype> class Graph
  5.  
  6. {
  7.  
  8. public:
  9.  
  10.  
  11. 	Graph(int node_num_max, int edge_num_max, void (*err_function)(char *) = NULL);
  12.  
  13. };

graph.cpp
C++ Syntax (Toggle Plain Text)
  1. #include "graph.h"
  2.  
  3. #include "instances.inc"
  4.  
  5.  
  6.  
  7. template <typename captype, typename tcaptype, typename flowtype> 
  8.  
  9. 	Graph<captype, tcaptype, flowtype>::Graph(int node_num_max, int edge_num_max, void (*err_function)(char *))
  10.  
  11. {
  12.  
  13.  
  14.  
  15. }

instances.inc
C++ Syntax (Toggle Plain Text)
  1. #include "graph.h"
  2.  
  3.  
  4.  
  5. template class Graph<int,int,int>;
  6.  
  7. template class Graph<short,int,int>;
  8.  
  9. template class Graph<float,float,float>;
  10.  
  11. template class Graph<double,double,double>;

Example.cpp
C++ Syntax (Toggle Plain Text)
  1.  
  2.  
  3. #include <stdio.h>
  4.  
  5. #include "graph.h"
  6.  
  7.  
  8.  
  9. int main()
  10.  
  11. {
  12.  
  13. 	typedef Graph<int,int,int> GraphType;
  14.  
  15. 	GraphType *g = new GraphType(/*estimated # of nodes*/ 2, /*estimated # of edges*/ 1); 
  16.  
  17.  
  18.  
  19. 	return 0;
  20.  
  21. }

Any ideas?

Thanks,
Dave
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Oct 12th, 2009
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Re: instances.inc?
Does any one have any clues for me?

Dave
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Re: instances.inc?
Click to Expand / Collapse  Quote originally posted by daviddoria ...
Does any one have any clues for me?

Dave
are u compiling it as
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  1. c++ Example.cpp graph.cpp
If not then do it like that.
Last edited by dkalita; Oct 12th, 2009 at 8:33 am.
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Oct 12th, 2009
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Re: instances.inc?
I am doing that:
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  1. [doriad@davedesktop test]$ g++ Example.cpp graph.cpp
  2. /tmp/ccHbyqCi.o: In function `main':
  3. Example.cpp:(.text+0x38): undefined reference to `Graph<int, int, int>::Graph(int, int, void (*)(char*))'
  4. collect2: ld returned 1 exit status

Can anyone confirm this behavior?
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Re: instances.inc?
Click to Expand / Collapse  Quote originally posted by daviddoria ...
C++ Syntax (Toggle Plain Text)
  1. GraphType *g = new GraphType(/*estimated # of nodes*/ 2, /*estimated # of edges*/ 1);
u are calling constructor
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  1. Graph<captype, tcaptype, flowtype>::Graph(int, int);
but u only have a constructor with prtotype
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  1. Graph<captype, tcaptype, flowtype>::Graph(int , int, void (*err_function)(char *));
Hence prototype mismatch. Correct it.
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Re: instances.inc?
I dont think so ...
The constructor is actually:
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  1. Graph(int node_num_max, int edge_num_max, void (*err_function)(char *) = NULL);

which is an optional parameter, no? Hence it should be fine to call it with only 2 ints?
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Re: instances.inc?
Click to Expand / Collapse  Quote originally posted by daviddoria ...
I dont think so ...
The constructor is actually:
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  1. Graph(int node_num_max, int edge_num_max, void (*err_function)(char *) = NULL);

which is an optional parameter, no? Hence it should be fine to call it with only 2 ints?
hey sorry for that. I skipped it.

The file graph.h is getting included twice in graph.cpp beacuse u are including it from instances.inc also.
Remove the
C++ Syntax (Toggle Plain Text)
  1. #include"graph.h"
statement from the file instances.inc.

I tried it in my compiler and i didn't get any error.

NB: whenever u are making some header file its good to define a macro such that

example.h
C++ Syntax (Toggle Plain Text)
  1. #ifndef EXAMPLE_H
  2. #define EXAMPLE_H
  3.  
  4. /*prototypes*/
  5.  
  6.  
  7. #endif
so that the same doesn't get included more than once.
Last edited by dkalita; Oct 12th, 2009 at 9:20 am.
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Re: instances.inc?
I'm still getting the same error. Can someone try these files:
http://www.rpi.edu/~doriad/Daniweb/maxflow/

with
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  1. g++ Example.cpp graph.cpp
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Re: instances.inc?
Click to Expand / Collapse  Quote originally posted by daviddoria ...
I'm still getting the same error. Can someone try these files:
http://www.rpi.edu/~doriad/Daniweb/maxflow/

with
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  1. g++ Example.cpp graph.cpp
I am not sure of why u are getting the error. I am compiling it as follows and m not getting any error in my machine.
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  1. myself@king  [70]g++ Example.cpp graph.cpp
  2. myself@king  [71]
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