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Groups > comp.lang.c++ > #70303
| From | Soviet_Mario <SovietMario@CCCP.MIR> |
|---|---|
| Newsgroups | comp.lang.c++ |
| Subject | Re: enum type in template declaration |
| Date | 2019-12-06 13:15 +0100 |
| Organization | A noiseless patient Spider |
| Message-ID | <qsdgou$paa$1@dont-email.me> (permalink) |
| References | <qsbvs3$81l$1@dont-email.me> <qscii5$5an$1@dont-email.me> |
Il 06/12/19 04:39, James Kuyper ha scritto:
> On 12/5/19 5:20 PM, Soviet_Mario wrote:
>> since what version of standard, if any, an ENUM type can be
>> an argument of a template ?
>
> It has always been possible to use an enumerated type as a template
> parameter.
sorry I'm not sure I have understood
Do you mean to use it as just a VALUE (instancing it) in an
generic integral parameter, or a proper TYPE-CHECKED
declaration (so that giving non typed integer value while
instancing would give a compile error) ?
> There is no special rule giving a enumerated type any
> different status from any other type in that regard.
Uhm ... ok, maybe I have outdated memories :\
>
>> sth like
>>
>> enum RestrictedValues { A = 1, B = 2, C = 4, D = 8 };
>>
>>
>> template <RestrictedValues ttVal> class SizedField
>
> However, you're not using an enumerated type as a template argument,
> you're using a enumeration value.
Mmmm, exactly the point I am misunderstanding. I believed to
have been able to establish a proper type-checking in that
declaration.
How instead it should have been written ?
can you correct my example in order to non accept non
specific-enum integral instancing ?
> That is a marginally newer feature of
> C++, though I believe that it still pre-dates the first version of the
> standard. There is no distinction for this purpose between values of
> enumerated type and those of any other integer type.
>
>
>
--
1) Resistere, resistere, resistere.
2) Se tutti pagano le tasse, le tasse le pagano tutti
Soviet_Mario - (aka Gatto_Vizzato)
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enum type in template declaration Soviet_Mario <SovietMario@CCCP.MIR> - 2019-12-05 23:20 +0100
Re: enum type in template declaration James Kuyper <jameskuyper@alumni.caltech.edu> - 2019-12-05 22:39 -0500
Re: enum type in template declaration Soviet_Mario <SovietMario@CCCP.MIR> - 2019-12-06 13:15 +0100
Re: enum type in template declaration Paavo Helde <myfirstname@osa.pri.ee> - 2019-12-06 14:42 +0200
Re: enum type in template declaration Soviet_Mario <SovietMario@CCCP.MIR> - 2019-12-06 17:20 +0100
Re: enum type in template declaration Paavo Helde <myfirstname@osa.pri.ee> - 2019-12-06 20:29 +0200
Re: enum type in template declaration Soviet_Mario <SovietMario@CCCP.MIR> - 2019-12-06 22:42 +0100
Re: enum type in template declaration Paavo Helde <myfirstname@osa.pri.ee> - 2019-12-07 00:51 +0200
Re: enum type in template declaration Soviet_Mario <SovietMario@CCCP.MIR> - 2019-12-07 18:54 +0100
Re: enum type in template declaration Öö Tiib <ootiib@hot.ee> - 2019-12-06 06:00 -0800
Re: enum type in template declaration James Kuyper <jameskuyper@alumni.caltech.edu> - 2019-12-06 09:56 -0500
Re: enum type in template declaration Manfred <noname@add.invalid> - 2019-12-06 15:56 +0100
Re: enum type in template declaration Soviet_Mario <SovietMario@CCCP.MIR> - 2019-12-06 18:43 +0100
Re: enum type in template declaration saturnman2008@gmail.com - 2019-12-07 01:53 -0800
Re: enum type in template declaration Soviet_Mario <SovietMario@CCCP.MIR> - 2019-12-07 18:57 +0100
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