From: Nathan Myers <ncm@cygnus.com>
To: egcs@cygnus.com
Subject: Re: [Q] about template specialization
Date: Mon, 27 Apr 1998 17:27:00 -0000 [thread overview]
Message-ID: <35450747.CDFAD8B8@cygnus.com> (raw)
In-Reply-To: <orlnsrvlnc.fsf.cygnus.egcs@garnize.lsd.dcc.unicamp.br>
Alexandre Oliva wrote:
>
> Ruslan Shevchenko <Ruslan@Shevchenko.Kiev.UA> writes:
>
> > template<class K, class E> inline
> > const K& default_key(const E&);
>
> > template<class T> inline
> > const T& default_key(const T& x)
>
> > virtual const K& get_key(const E& x)
> > { return default_key<K,E>(x); }
>
> > I think that X<Y,Y>::get_key must call specialization (i. e. second
> > definition)
>
> There's not such thing as partial specialization of a function
> templates. You have just overloaded `default_key' with two different
> template functions. In this case, you will always have to explicitly
> specify template arguments. Since you specify default_key<K,E>, not
> just default_key<K>, you are selecting the first definition.
When the specialization semantics of function templates are not
what you want, you can use a function object to get a similar
result. A function template can still be used for the interface.
Nathan Myers
ncm@cantrip.org
prev parent reply other threads:[~1998-04-27 17:27 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
1998-04-25 11:59 Ruslan Shevchenko
1998-04-27 0:33 ` Alexandre Oliva
[not found] ` <orlnsrvlnc.fsf.cygnus.egcs@garnize.lsd.dcc.unicamp.br>
1998-04-27 17:27 ` Nathan Myers [this message]
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