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From: gtodd@cix.compulink.co.uk (Giles Todd)
Newsgroups: comp.lang.c++
Subject: Re: const in a class
Message-ID: <1991Jun17.184324.1979@demon.co.uk>
Date: 17 Jun 91 18:43:24 GMT
Sender: news@demon.co.uk (C-News Owner)
Reply-To: Giles Todd <gtodd@cix.compulink.co.uk>
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Lines: 42

In-Reply-To: <768@taumet.com> steve@taumet.com (Stephen Clamage)

steve@taumet.com (Stephen Clamage) writes:

> Chris_Sullivan@kcbbs.gen.nz (Chris Sullivan) writes:
> 
> >I want to be able to declare a local constant in a class ie a constant
> >whose scope is restricted to the class...
> 
> >class C {
> >  const int size = 1000;
> >  char array[size];
> >  ...
> >  }
> 
> Unfortunately, this is not supported in C++.  The best you can do
> is to declare an enum:
> class C {
>     enum { size = 1000 };
>     char array[size];
>     ...
> };

Careful here.  The value of an enumerator must be an int or a value that
can be promoted to int by integral promotion.  If the compiler implementor
has decided to represent enums with chars then your example will overflow
(perhaps silently).  For safety's sake, limit the values of enums to the
range 0..127.

Giles.
--
Giles Todd             gtodd%cix@specialix.co.uk (Internet)
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