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- Path: engnews1.Eng.Sun.COM!taumet!clamage
- From: James Kanze US/ESC 60/3/141 #40763 <kanze@lts.sel.alcatel.de>
- Newsgroups: comp.std.c++
- Subject: Re: double const declarations
- Date: 26 Mar 1996 16:23:07 GMT
- Organization: ?
- Approved: clamage@eng.sun.com (comp.std.c++)
- Message-ID: <9603261135.AA22454@lts.sel.alcatel.de>
- References: <Pine.A32.3.91.960325093715.29874A-100000@zorglub.cae.ca>
- NNTP-Posting-Host: taumet.eng.sun.com
- In-Reply-To: dak's message of 25 Mar 1996 10:09:28 PST
- Content-Length: 1279
- X-Lines: 33
- Originator: clamage@taumet
-
- In article <Pine.A32.3.91.960325093715.29874A-100000@zorglub.cae.ca>
- dak <pierreba@poster.cae.ca> writes:
-
- |> I've just encountered a problem in one of our template design and wondered
- |> what could be done about it. It concerns const reference return value from
- |> a templated member function, for example:
-
- |> template <class T> class SmartPtr
- |> {
- |> // ... whatever:
- |> public:
- |> const T & Dereference ();
- |> };
-
- |> The problem arise when T is instantiated with a Container of constants:
-
- |> SmartPtr<const int> a;
-
- |> Here we have a double const which is not supported by the compiler, nor the
- |> standard, I believe. Is there a fix or should we abandon all hope of using
- |> const returns in templates ?
-
- The draft standard forbids two explicit const's. If the duplicate
- Const result from typedef's, etc., it's OK. (I don't know if the
- actual words mention template instantiation types, but if they don't
- I'm sure that it is an editorial oversight, and not the intent.)
-
- --
- James Kanze Tel.: (+33) 88 14 49 00 email: kanze@gabi-soft.fr
- GABI Software, Sarl., 8 rue des Francs-Bourgeois, F-67000 Strasbourg, France
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