[C++-sig] Re: Pyste bug with unnamed enums

[Roman Yakovenko]

	Okay. I understand your answer. Than you.
But I steel have to export unnamed enum. 
What do you think about declaring them as consts ( within scope of module / class ) ?
It seems me that this is a way I should go.
More over this is exactly their meaning in my code.

Thanks you for help. Roman




> -----Original Message-----
> From: David Abrahams [mailto:dave at boost-consulting.com]
> Sent: Tuesday, February 17, 2004 6:38 PM
> To: c++-sig at python.org
> Subject: [C++-sig] Re: Pyste bug with unnamed enums
> 
> 
> "Roman Yakovenko" <roman.yakovenko at actimize.com> writes:
> 
> > 	Hi. I found bug in Pyste.
> >
> > Description:
> > In your code you have 2 unnamed enum definitions
> >
> > enum { SOME_CONST_1 = 32 };
> > enum { SOME_CONST_2 = 46 };
> >
> > after running pyste on this code you will get 
> >
> > // Unique type for unnamed enums
> > #ifndef PYSTE_UNIQUE_INT_DEFINED
> > #define PYSTE_UNIQUE_INT_DEFINED
> > template<int num>
> > struct UniqueInt {
> >    int v;
> >    enum { value=num };
> >    UniqueInt(int v_):
> >        v(v_)
> >    {}
> >    operator int() const
> >    { return v; }
> > };
> > #endif // PYSTE_UNIQUE_INT_DEFINED 
> >
> > generated twice ( if you generate your code to the same module ).
> >
> > The possible solution are: 
> >  1. To ask David Abrahams how we should export unnamed enums (
> >  defined within class and within some namespace ).
> 
> Name them.  If you can't name them, you can't export them.  You can't
> even pass them through a function template:
> 
>   enum { x = 1 };
> 
>   template <class T>
>   int f(T);
> 
>   int y = f(x);  // error
> 
> Sorry.
> 
> >  2. To use unnamed enums as global constants for enums 
> defined within namespace.
> >      To define new class attribute if enum defined within class.
> >  3. To put definition of UniqueInt within BPL
> 
> :(
> 
> I don't really know what UniqueInt is supposed to do, but I don't
> love it because it's not unique ;-)
> 
>  enum { x = 1 }
>  enum { y = 1 }
> 
>  
> BOOST_STATIC_ASSERT((boost::is_same<UniqueInt<x>,UniqueInt<y> 
> >::value));
> 
> 
> -- 
> Dave Abrahams
> Boost Consulting
> www.boost-consulting.com
> 
> 
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