RE: [boost] Generic non-derivable base class

From: Reece Dunn (msclrhd_at_[hidden])
Date: 2004-04-06 17:59:29

Matthew Vogt wrote:
>The following simple base class implements the mechanism as dicussed on
>Stroustrup's FAQ page, and encapsulates the virtual inheritance so that the
>class can be non-virtually inherited, removing the most obvious chance of
>implementation error.

>Will this code work on multiple platforms?  I have only tested on gcc 
>3.2...
>[snip]

I have tested on MS VC 6.0 sp5, 7.0 and 7.1 without any problems. On Borland 
5.5.1 however, I am getting the following errors (tested in my errorcheck 
component):

[log]

Error E2404 d:\devel\adl++\include\boost/errorcheck.hpp 23: Dependent type 
qualifier 
'boost::detail::nonderivable_base<boost::errorcheck<boost::policy::error_storage<int>,boost::policy::no_errormsg_storage> 
 >' has no member type named 'identity' in function main()

Error E2061 d:\devel\adl++\include\boost/errorcheck.hpp 23: Friends must be 
functions or classes in function main()

Error E2029 d:\devel\adl++\include\boost/errorcheck.hpp 33: 
'boost::detail::nonderivable_base<boost::errorcheck<boost::policy::error_storage<int>,boost::policy::no_errormsg_storage> 
 >' must be a previously defined class or struct in function main()

Error E2029 d:\devel\adl++\include\boost/errorcheck.hpp 136: 
'boost::nonderivable<boost::errorcheck<boost::policy::error_storage<int>,boost::policy::no_errormsg_storage> 
 >' must be a previously defined class or struct in function main()

[/log]

I don't have any workarounds at present.

Regards,
Reece

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