Re: [boost] [mpl] problems with borland 5.6.4

From: Aleksey Gurtovoy (agurtovoy_at_[hidden])
Date: 2004-09-05 06:07:04

Hugo Duncan writes:
> The following does not compile, on bcc 564 with latest pserver CVS.
> The Variant definition is similar to the one Borland provides in
> their VCL headers (and the problem therefore exists with any
> code that uses the VCL).
> 
> The error message is
>     E2015 Ambiguity between 'operator !=(int,const Variant &)' and '!='
> 
> Removing the mpl include gets rid of the compile error.
> 
> Any ideas?

Nasty Borland bug:

    namespace aux {
    enum My {};
    bool operator!=(My, My);
    }

    struct Variant { Variant(int); };

    enum Abc { abcd, abcde };

    bool operator!=(int, const Variant&);

    int main()
    {
        return abcde != abcd; // ambiguity 
    }

Workarounded in the CVS.

Thank you for the report,
--
Aleksey Gurtovoy
MetaCommunications Engineering