Newsgroups:	comp.os.msdos.djgpp
From:	Peter Berdeklis <peter AT atmosp DOT physics DOT utoronto DOT ca>
Subject:	Re: Templates in the STL
Message-ID:	<Pine.SGI.3.91.970329073728.2783A-100000@atmosp.physics.utoronto.ca>
Nntp-Posting-Host:	chinook.physics.utoronto.ca
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Organization:	University of Toronto - Dept. of Physics
In-Reply-To:	<333A86BD.255E@rtp.gtegsc.com>
Date:	Sat, 29 Mar 1997 12:40:48 GMT
References:	<199703262318 DOT SAA01194 AT delorie DOT com> <333A86BD DOT 255E AT rtp DOT gtegsc DOT com>
Lines:	32
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

On Thu, 27 Mar 1997, David McKee wrote:

> I have recently downloaded the STL to use as a foundation for 
> my development.  I have not yet used it with DJGPP but I have 
> seen other posts here that it works great.
[snip]

> template <class Result, class Argument = Result>
> struct constant_unary_fun : public unary_function<Argument, Result> {
>   result_type val;
>   constant_unary_fun(const result_type& v) : val(v) {}
>   const result_type& operator()(const argument_type&) const { return
> val; }
> };
> 
> I get errors for the '=' as the compiler syas it is expecting a ','
> or another class, etc.  My question is: Is the = sign in templates
> a new and widely unsupported feature of templates?  If so, does djgpp
> and gcc handle them correctly?  Is there work arounds for this as I 
> am just learning the intracies of templates. 

"class Argument = Result" is a default template argument, and not very 
many compilers support them yet.  They are relatively recent additions to 
the draft standard.  gcc does not support them yet - maybe in version 2.8.0?

By the way, gcc/DJGPP comes with a version of STL.  Use it, since its 
been tweaked to work with gcc.

---------------
Peter Berdeklis
Dept. of Physics, Univ. of Toronto

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