namespace help

[lallous]

file: prog1.cpp
#include <stdio.h>
#include "temp1.h"

int main()
{
double d;
Templ1::func(d) ;
return 0;
}

file: temp1.h
namespace Templ1
{
template <class T> void func(T &);
}

file:temp1.cpp
namespace Templ1
{
template <class T> void func(T &i)
{
i = 0;
}
}

When I compile using VC, I get:
Linking...
prog1.obj : error LNK2001: unresolved external symbol "void __cdecl
Templ1::func(in t &)" (?func@Templ1@@ YAXAAH@Z)
Debug/prog1.exe : fatal error LNK1120: 1 unresolved externals

How can I still use templated version func() from different module (temp1.*)

Regards,
Elias

[Russell Hanneken]

Re: namespace help

lallous wrote:[color=blue]
> file: temp1.h
> namespace Templ1
> {
> template <class T> void func(T &);
> }
>
> file:temp1.cpp
> namespace Templ1
> {
> template <class T> void func(T &i)
> {
> i = 0;
> }
> }
>
> When I compile using VC, I get:
> Linking...
> prog1.obj : error LNK2001: unresolved external symbol "void __cdecl
> Templ1::func(in t &)" (?func@Templ1@@ YAXAAH@Z)
> Debug/prog1.exe : fatal error LNK1120: 1 unresolved externals
>
> How can I still use templated version func() from different module
> (temp1.*)[/color]

Check the FAQ:

http://www.parashift.com/c++-faq-lite/containers-and-templates.html#faq-34.12

Regards,

Russell Hanneken
rghanneken@pobo x.com
Remove the 'g' from my address to send me mail.

[lallous]

Re: namespace help

"Russell Hanneken" <rghanneken@pob ox.com> wrote in message
news:j7cpb.2388 $qh2.2054@newsr ead4.news.pas.e arthlink.net...[color=blue]
> lallous wrote:[color=green]
> > file: temp1.h
> > namespace Templ1
> > {
> > template <class T> void func(T &);
> > }
> >
> > file:temp1.cpp
> > namespace Templ1
> > {
> > template <class T> void func(T &i)
> > {
> > i = 0;
> > }
> > }
> >
> > When I compile using VC, I get:
> > Linking...
> > prog1.obj : error LNK2001: unresolved external symbol "void __cdecl
> > Templ1::func(in t &)" (?func@Templ1@@ YAXAAH@Z)
> > Debug/prog1.exe : fatal error LNK1120: 1 unresolved externals
> >
> > How can I still use templated version func() from different module
> > (temp1.*)[/color]
>
> Check the FAQ:
>
>[/color]

http://www.parashift.com/c++-faq-lite/containers-and-templates.html#faq-34.1

2[color=blue]
>
> Regards,
>
> Russell Hanneken
> rghanneken@pobo x.com
> Remove the 'g' from my address to send me mail.
>
>[/color]
Hello,
So I understand that I must say: #include "temp1.cpp" instead of ".h" (or
move implementation into header file) ?

What alternative do you suggest, even if I have to redesign my code...
I want to use templates and namespace...

Currently, I put in header file different version of func() as:
funcInt(int &r);
funcDouble(doub le &r);

then in cpp file I put:
void funcInt(int &i)
{
func(i);
}

void funcDouble(doub le &i)
{
func(i);
}


Regards,
Elias

[Rolf Magnus]

Re: namespace help

lallous wrote:
[color=blue]
> So I understand that I must say: #include "temp1.cpp" instead of ".h"
> (or move implementation into header file) ?[/color]

or #include the .cpp file at the end of the header.