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From: Martin Dowie <martin.dowie@btopenworld.com>
Newsgroups: comp.lang.ada
Subject: Re: Negative float problem
Date: Tue, 1 Nov 2005 17:19:05 +0000 (UTC)
Organization: BT Openworld
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Date: 2005-11-01T17:19:05+00:00
List-Id: <comp.lang.ada>

Hyman Rosen wrote:
> Martin Dowie wrote:
> 
>>Yup, you can't have overloaded enumeration values
>>I guess because they are really just 'int', so which
>>one would you mean?
> 
> 
> No, that's not why. Enumerators have the type of their
> enumeration. But enumerators go into their enclosing
> namespace or class, so having multiple ones causes name
> conflicts. You can actually simulate Ada's approach in
> C++ by hand, as I show below. You can probably reduce
> the boilerplate even more by using the Boost preprocessor
> library, and that would also let you automatically get
> string versions of the enumerators like Ada has.
> 
> #include <iostream>
> #include <ostream>
> 
> struct Color { enum E { Red, Blue }; typedef E (&e)(E); };
> struct Traffic_Light { enum E { Green, Amber, Red }; typedef E (&e)(E);
> };
> 
> #define EDEF(C,e) C::E e(C::E = C::e) { return C::e; }
> EDEF(Color, Red)
> EDEF(Color, Blue)
> EDEF(Traffic_Light, Green)
> EDEF(Traffic_Light, Amber)
> EDEF(Traffic_Light, Red)
> 
> void f_c(Color::e v)
>  { std::cout << "Color: " << v(Color::E()) << "\n"; }
> void f_t(Traffic_Light::e v)
>  { std::cout << "Traffic_Light: " << v(Traffic_Light::E()) << "\n"; }
> 
> // Notice there are two Reds defined at global scope with no conflict
> // and that each function is called with the proper Red.
> int main() { f_c(Red); f_t(Red); }
> 

Thanks for that...

...although I might add this example to the list of reasons I really 
can't be bothered with C++ : what a palaver!!! ;-)