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-From: "Klaus Eichner" <klaus_gb@yahoo.com>
-Date: Sat, 26 Jul 2003 14:53:23 +0100
-Newsgroups: comp.lang.c++
-Subject: Re: enum count
-
-"Clive" <clive@clive.clive> wrote in message
-news:3f21e5cc$0$23611$5a62ac22@freenews.iinet.net.au...
-> If you have an enum, is there any way during execution to find the number
-of
-> values in the enum?
-> Say I have,
->
-> enum great { five, ten, fifteen };
->
-> How could I get the number 3 from that?
-
-You could get the number 3 from 'great' with your own, user-defined
-'Enum_Info' template:
-
-cout << "The number of values in enum great is "
- << Enum_Info<great>::number_of_elements
- << endl;
-
-The 'Enum_Info' template is defined as follows.
-Suppose you have the following enums:
-
-enum great { five, ten, fifteen };
-enum greater { none, one, fourtytwo, fourtythree, fourtyfour };
-enum even_greater { minusone, minustwo, minusthree, minusfour, minusfive,
-minussix, minusseven };
-
-You could build a template class 'Enum_Info' which uses specialisation to
-register the number of elements in each enum
-
-template <class T> class Enum_Info { };
-template <> class Enum_Info<great> { static const int number_of_elements =
-3; };
-template <> class Enum_Info<greater> { static const int number_of_elements =
-5; };
-template <> class Enum_Info<even_greater> { static const int
-number_of_elements = 7; };
-
-
-
-$Id$