From:	"Rafal Maj" <maj_rafal AT poczta DOT onet DOT pl>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Odp: Library with templates - help !!!!!!!!!!!!!
Date:	Sat, 20 Jan 2001 19:57:26 +0100
Organization:	Academic Computer Center CYFRONET AGH
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Thanks
So, In djgpp C++ I can use library as *.cc + *.h file, until I will use
templates, and yet ther isn't any way to use templates in librarys ?
P.S. What for are options like -frepo, -falt-external-templates ?



Użytkownik <pavenis AT lanet DOT lv> w wiadomooci do grup dyskusyjnych
napisał:3A69F3B9 DOT 12173 DOT 67F409 AT localhost...
> On 20 Jan 2001, at 14:21, Rafal Maj wrote:
>
> > Hi,
> > I have problem when I compile program using library with templates.
> > Project file contains bugmain.cc & bug.cc. In this example, bugmain.cc
is my
> > mian program, bug.cc is my library & bug.h is library header. I have
> > problems to build my program when I'm using templates in my library.
> > I get error report :
> >
> > Compiling: bugmain.cc
> > no errors
> > Creating: bug.exe
> > Error: bugmain.o: In function `main':
> > bugmain.cc(2) Error: undefined reference to `box<int>::move(int)'
> > There were some errors
> >
> > Box is my template class and move is simple function inside bug
ctemplate
> > class.
> > Can somebody help me ???????
> >
> > I know, that there are options like -frepo, no-implict-templates, etc...
but
> > I realy don't know how to set them to make my exaple work.
> >
> > If You can help me, please write exacly what should be compiler & linker
> > options, and what I have to change inside my source files.
> > Maybe You can correct my project file, then send it to me
> >  maj_rafal AT poczta DOT onet DOT pl  )?
> >
> > ============ PROJECT WINDOW ==========
> > bug.cc
> > bugmain.cc
> > ================== BUG.CC ================
> > template <class typ> void box<typ>::move(typ d) {
> >   x+=d;  y+=d;
> > }
>
> Compiler should see this code (bug.cc) when compiling bugmain.cc.
> C++ standard includes keyword 'export' (not implemented in GCC yet,
> don't ask me when this will happen ...) for separate compilation
> of templates.
>
> So append contents of bug.cc to bug.h and all should be OK
>
> > ================== BUGMAIN.CC =================
> > #include "bug.h"
> > main() {
> >   box<int> b;
> >   b.move(5);
> > }
> > ================== BUG.H ===============
> > template <class typ>
> > class box {
> >   public :
> >     typ x,y;
> >     void move(typ d);
> > };
> > =========================================================
> >
> > Thanks in advice ;-)
> > Rafa
> >
>

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