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From: starr-page@cs.yale.edu (Page Starr)
Newsgroups: comp.lang.c++
Subject: Re: Constant member variables in TC++
Message-ID: <1990Nov11.135118@cs.yale.edu>
Date: 11 Nov 90 18:51:17 GMT
References: <AHUTTUNE.90Nov11180721@wonderwoman.hut.fi>
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Reply-To: starr-page@cs.yale.edu (Page Starr)
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In article <AHUTTUNE.90Nov11180721@wonderwoman.hut.fi>,
ahuttune@niksula.hut.fi (Ari Juhani Huttunen) writes:
|> An example class:
|> 
|> class X {
|> const int const_int;
|> };
|> 
|> Gives a warning: constant field not initialized.
|> 
|> class X {
|> const int const_int = 5;
|> };
|> 
|> Gives an error: can't initialize a field.
|> 
|> So???????
|> --

constant members in classes are initialized in the member initialization
list.
So the correct solution here would be:

class X {
const int const_int;
X(): const_int(5) {;}
};

If you don't want a constant in each object, the correct solution would
be:

class X2{
static const int const_int2;
};

and then in one .C file:

const int X2::const_int2 = 5;

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