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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: Tue, 31 Oct 95 18:26:44 PST
References: <DH846s DOT 3J9 AT hermes DOT hrz DOT uni-bielefeld DOT de>
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To: djgpp AT sun DOT soe DOT clarkson DOT edu
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Andre Krause <akrause AT techfak DOT uni-bielefeld DOT de> writes:

> Another Method wich works also for Borland Compilers is the following:
> You append at the very end in the "certain module" a function similiar
>  to this:
> 
> void __foo()
> {
> 	CLASSNAME<type> a1;
> 	// for example
> 	VEKTOR2D<int> a2;
> 	VEKTOR2D<float> a3;
> }
> 
> this will work with most compilers while the method

True, but this method won't always instantiate overloaded non-member 
operator functions.

With DJGPP, I even found that explicitly attempting to invoke some 
overloaded non-member operators (such as the insertion operator for 
streams, operator <<) won't instantiate the function -- you'll still 
get unresolved symbols in the link.  For DJGPP, in some circumstances, 
you _must_ use some other method (namely the explicit instantiation 
you refer to below).

> template VEKTOR2D<int>;
> 
> works only for gpp.

I believe that this explicit template instantiation method is at least 
a draft standard (I'm not sure about this); it's supported in 
CodeWarrior 6 and 7, for instance.  (Although I did find a bug with 
trying to use this method for instantiation non-member overloaded 
operators in CodeWarrior 7 -- it _does_ work without a hitch in DJGPP 
in all cases I've tried).


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