From: schuster AT eev DOT e-technik DOT uni-erlangen DOT de
Newsgroups: comp.os.msdos.djgpp
Subject: C++ templates question
Date: Fri, 17 Apr 1998 07:00:15 GMT
Organization: Regionales Rechenzentrum Erlangen, Germany
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To: djgpp AT delorie DOT com
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Hi !
When writing some C++ code with djgpp, i've encountered the following 
problem with templates (I don't know if this is a bit off topic, but 
don't know if it's a general c++ question or a djgpp - c++ question 
either)
Look at:


#include <string.h>
template <class T> class test
{ 
   int a;
   char r[34];
 public:
   test(int integ, char* string);
};
template <class T> test<T>::test(int integ, char* string)
{
   a=integ;
   strcpy(string,r);
}
int main()
{
 test<int> Ttest(1,"S");  
}


this works fine, but when changing to the following, the linker says 
undefined reference to 
the constructor of class <T> test. (look at the position of test<int> 
Ttest(1,"S") )

#include <string.h>
template <class T> class test
{ 
   int a;
   char r[34];
 public:
   test(int integ, char* string);
};
template <class T> test<T>::test(int integ, char* string)
{
   a=integ;
   strcpy(string,r);
}
test<int> Ttest(1,"S");  
int main()
{

}

if I change it to the next all works fine. Any idea why. Is this 
normal or djgpp - c++ spezific?
Thanks
Michi

#include <string.h>
template <class T> class test
{ 
   int a;
   char r[34];
 public:
   test(int integ, char* string){
   a=integ;
   strcpy(string,r);
   }

};
test<int> Ttest(1,"S");  
int main()
{

}