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From: max AT alcyone DOT darkside DOT com (Erik Max Francis)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Templates in DJGPP.
Date: Fri, 27 Oct 95 18:11:35 PST
References: <1995Oct27 DOT 092027 AT zipi DOT fi DOT upm DOT es>
Organization: &tSftDotIotE
Lines: 43
To: djgpp AT sun DOT soe DOT clarkson DOT edu
Dj-Gateway: from newsgroup comp.os.msdos.djgpp

a920101 AT zipi DOT fi DOT upm DOT es writes:

> How do I use them in GCC??? I've searched in the docs and so, but can't find
> anything. Help?

The information you need _is_ in the info files; it's just not 
straightforward or easy to find.  (I plagued this group a while ago 
with questions about templates myself.)

What you basically have to do is 1. define the template class, 2. 
instantiate it in a certain module for your particular application, 
and 3. include that module in with the rest of your modules for 
linkage.

Search around in the gcc documentation for templates; you should find 
the information you need.  Basically, what you do is make whatever 
typedefs you feel are appropriate, and then instantiate the template 
with a syntax which looks like a prototype definition (using 
templates) for everything you need.

First you do something like

    template class LIST<Data>;

that instantiates the class itself and its member functions.  For out- 
of-line member functions, say, an operator << function for writing a 
LIST<Data> to an iostream, you use a template instantiation something 
like the following:

    template ostream &operator <<(ostream &o, const LIST<Data> list);

This should do the trick.  I use this on a regular basis and have 
never seen any troubles.  I've found that with gcc if you try the 
other route, which is to _use_ the template classes in this manner 
(even if you do it in a way which is never used), the instantiations 
seem to be optimized out.  The above description is the way to go.


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