From:	Hans-Bernhard Broeker <broeker AT physik DOT rwth-aachen DOT de>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Compiling problem
Date:	19 Oct 2001 10:13:06 GMT
Organization:	Aachen University of Technology (RWTH)
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R. Grela <rgrela AT ciudad DOT com DOT ar> wrote:
> I'm trying to compile a template class, I don't know what I am doing wrong:
> I 've this: (it's the simplest test)
[...]
> --- test.cpp ---
> #include "test.h"

> template <class T>
> test<T>::test()
> {
> }
> --- end of test.cpp ---

Here's your problem.  It's a basic misunderstanding of how templates
work, in all but the very latest dialects of C++ (--> the new
"exports" keyword).  

One of the main differences between an ordinary class and a template
is that a template cannot usually have a separate implementation file
(like this test.cpp of yours) --- the whole implementation *must* be
#included into the code using the template, i.e. it should be in the
header file.  Templates cannot be compiled separately.

A quick fix would be to remove the #include test.h from your test.cpp,
and instead #include "test.cpp" at the end of test.h. Or just copy the
contents into there, right away.
-- 
Hans-Bernhard Broeker (broeker AT physik DOT rwth-aachen DOT de)
Even if all the snow were burnt, ashes would remain.

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