compiling template example

[mfabricius@gmail.com]

Hi,

I am sure it's silly.

I get the error:
/tmp/ccyVx871.o: In function `main':
UseStack.cpp:(. text+0x8b): undefined reference to `Stack<int>::St ack()'
UseStack.cpp:(. text+0x9e): undefined reference to
`Stack<int>::pu sh(int)'
UseStack.cpp:(. text+0xa9): undefined reference to `Stack<int>::po p()'
UseStack.cpp:(. text+0xea): undefined reference to
`Stack<int>::~S tack()'
UseStack.cpp:(. text+0x105): undefined reference to
`Stack<int>::~S tack()'
collect2: ld returned 1 exit status

when I try to compile following code. If I put main() into Stack.cpp it
works. What am I missing?
(I use g++ 4.1.2)

Thanks!

Max

Stack.h:
-----------------------------
#ifndef _Stack_h
#define _Stack_h
template <class T>
class Stack {
protected:
struct elem{
T value;
elem* next;
};

elem* current;
int count;

public:
void push(T);
T pop();
Stack() ;
~Stack();

};

Stack.cpp:
-----------------------------
#include "Stack.h"

#include<iostre am>

using namespace std;

template <class T>
void Stack<T>::push( T value)
{
elem* e = new elem;
e->value = value;
e->next = Stack::current;
Stack::current = e;
Stack::count++;
}

template <class T>
T Stack<T>::pop()
{
if (Stack::count == 0 ){
cerr << "Error: Stack empty!\n",
exit(-1);
}else{
elem* e = Stack::current;
Stack::current = e->next;
Stack::count--;
T v = e->value;
delete e;
return v;
}

}


template <class T>
Stack<T>::Stack (){
current = 0;
count = 0;
}

template <class T>
Stack<T>::~Stac k(){
while(count 0)
Stack::pop();

}

UseStack.cpp:
-----------------------------
#include "Stack.h"
#include <iostream>
#include <vector>
#include "Stack.h"


using namespace std;
int main(){
Stack<inta;
a.push(5);
std::cout << "Value : " << a.pop() << "\n";
}

[kwikius]

Re: compiling template example


mfabricius@gmai l.com wrote:

Hi,
>
I am sure it's silly.

try the templates faq:

http://www.parashift.com/c++-faq-lite/templates.html#faq-35.12

regards
Andy Little

[maximilian.fabricius@gmail.com]

Re: compiling template example


kwikius wrote:

mfabricius@gmai l.com wrote:

Hi,

I am sure it's silly.

>
try the templates faq:
>

http://www.parashift.com/c++-faq-lite/templates.html#faq-35.12

>
regards
Andy Little

This did help!

Thanks a lot!

Max