Re: Template Class Problem

Re: Template Class Problem

[Mike Stump]

> From: Gerald Gutierrez <gutier@intergate.bc.ca>
> To: egcs-bugs@egcs.cygnus.com
> Date: Tue, 27 Apr 1999 00:33:50 -0700

> Below is what I believe to be another problem with templates.

Yes and no.  Yes, long term the compiler will switch over to work how
you expect.  We know about this.  But, it is unlikely to happen
anytime soon.  In the mean time, you must include all definitions in
all files that make any use of templates.  This is a limitation of
many C++ compilers.

> I've got a parameterized class called Alpha within the files
> Alpha.cc and Alpha.h.  They compile fine but after the compile
> Alpha.o doesn't contain any symbols relating to the Alpha class!

It is working as designed.  Use -frepo, or try defining the termplates
in all files that use them.

Template class problem

[C Chan]

How can I tell the compiler to instantiations the template class( not the
stl lib, I build a library to have template calss)?
I have been including the source file ( e.g. #include "template1.cpp" in the
template1.h file).
Then I setted the INCLUDE_TEMPLATE_DEFINITION macro in the Makefile. But it
still does not work.

Thanks.

CC Chan

Template Class Problem

[Gerald Gutierrez]

EGCS-1.1.2
Redhat 5.2 Intel

Below is what I believe to be another problem with templates. I've got a
parameterized class called Alpha within the files Alpha.cc and Alpha.h.
They compile fine but after the compile Alpha.o doesn't contain any
symbols relating to the Alpha class! Naturally, links against this file
fail.

If this is somehow my fault or it is a bug and there is a workaround,
please let me know. This particular problem is seriously hosing me ...

[ template_bug]$ ls -l
total 2
-rw-rw-r--   1 gerald   gerald        114 Apr 27 00:33 Alpha.cc
-rw-rw-r--   1 gerald   gerald         82 Apr 27 00:32 Alpha.h
[ template_bug]$ cat Alpha.h

template<class T>
class Alpha

public:
    Alpha (void);
    ~Alpha (void);
};

[ template_bug]$ cat Alpha.cc

#include "Alpha.h"

template<class T>
Alpha<T>::Alpha (void) { }

template<class T>
Alpha<T>::~Alpha (void) { }

[ template_bug]$ g++ -c Alpha.cc
[ template_bug]$ ls -l
total 3
-rw-rw-r--   1 gerald   gerald        114 Apr 27 00:33 Alpha.cc
-rw-rw-r--   1 gerald   gerald         82 Apr 27 00:32 Alpha.h
-rw-rw-r--   1 gerald   gerald        817 Apr 27 00:38 Alpha.o
[ template_bug]$ nm --demangle Alpha.o
00000000 ? __FRAME_BEGIN__
00000000 t gcc2_compiled.
[ template_bug]$