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Old 10-19-2004, 04:32 PM   #1
Wynd
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Registered: Jul 2001
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C++ - class template - linker errors?


I'm trying to write a linked-list type queue class with a template. My code compiles without errors or warnings, but when it links I get this:

main.o(.text+0x19): In function `main':
: undefined reference to `WaitQueue<int>::WaitQueue[in-charge]()'
main.o(.text+0x6e): In function `main':
: undefined reference to `WaitQueue<int>::push(int const&)'
main.o(.text+0x93): In function `main':
: undefined reference to `WaitQueue<int>::~WaitQueue [in-charge]()'
main.o(.text+0xb1): In function `main':
: undefined reference to `WaitQueue<int>::~WaitQueue [in-charge]()'

My code in main.cpp is
Code:
#include <iostream>
using namespace std;
#include "WaitQueue.h"

int main()
{
	WaitQueue<int> wc;
	int tmp;

	cout << "Enter some ints (-1 to stop):" << endl;
	cin >> tmp;

	while (tmp != -1)
	{
		wc.push(tmp);
		cin >> tmp;
	}
	return 0;
}
Does anyone know how to fix this?
 
Old 10-19-2004, 04:50 PM   #2
deiussum
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Well, since you didn't post the contents of WaitQueue.h, I can only guess. My guess is that you are trying to only declare the WaitQueue class in the .h, and trying to implement that in a WaitQueue.cpp file.

If that is the case, it won't work with template classes. You have to have the entire class definition in the header. There was a thread on this here recently with a more detailed explanation of why that is, that you might want to search for...
 
Old 10-19-2004, 04:54 PM   #3
deiussum
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Since I have a bit of time, I decided to search for that thread for you. And here is where it is...
 
  


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