From:	Nate Eldredge <neldredge AT hmc DOT edu>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Authors of DJGPP / GCC - #export needed !
Date:	22 Jan 2001 09:53:53 -0800
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Dieter Demerre <ext DOT dieter DOT demerre AT siemens DOT be> writes:

> On Mon, 22 Jan 2001, Andris Pavenis wrote:
> 
> > On Sun, 21 Jan 2001, Rafal Maj wrote:
> >
> > > When #export will be implemented in DJGPP ?  Next month :), maybe next year
> > > :(  ?
> > > I'm stuck because my program realy needs to use template class in libraries
> > > and now I'm waiting for this #export keyword...
> > > By the way... why is it realy so incredibly hard to implement ?
> > > Maybe writting future-request directly to authors of GCC may help... do
> > > somebody know their email ?
> > > Rafał
> >
> > I think no one will be able to answer You now. It will be supported when
> > GCC will support it. Currently it's not in development version of gcc and
> > there are no plans for it in nearest future AFAIK. For more info go to
> > http://gcc.gnu.org and search gcc related mailing lists for this topic ...
> 
> Can anybody direct me to information about this #export directive ? I
> consulted the C++-primer and couldn't find anything about it.  Are you
> (Rafal) sure it's part of any standard ?

An `export' (not `#export') keyword is described in Stroustrup 4ed
section 13.7.  It's intended to work like the following:

foo.h:
template<class T> void foo (const T&);

foo.cc:
#include "foo.h"
export template<class T> void foo (const T& arg) { ... }

So maybe this is what the original poster has in mind.

AFAIK, this feature is hard to implement because it requires a fair
amount of magic in both the compiler and linker.  See also the node
"Template Instantiation" in the GCC docs.

-- 

Nate Eldredge
neldredge AT hmc DOT edu

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