Re: [Boost-users] Problem with dll and BOOST_STATIC_ASSERT

From: Frank (opcode_at_[hidden])
Date: 2005-11-04 16:19:07

João Abecasis <jpabecasis <at> gmail.com> writes:

> 
> Frank wrote:
> > I 'm trying to put the implementation into a dll and mark the explicit
> > instantiation of Normal as exported with the following results:
> > 1) With the small_dim_ctor's enabled I get the static assertion when marked
> > for export
> > 2) With the small_dim_ctor's enabled everything is ok when not marked for
> > export
> > 3) With the small_dim_ctor's disabled everything is ok regardless of export
> > marking
> > 4) If I comment out the BOOST_STATIC_ASSERT and build my app with export
> > enabled I can use the resulting dll without any problems
> > 
> > I'm thinking that marking for export is somewhow generating an implicit
> > conversion somewhere but I don't know how.
> 
> I suppose marking the class for export could instantiate all member 
> functions and constructors and thus trigger the static assertions.
> 
> Have you considered using boost::enable_if instead of BOOST_STATIC_ASSERT?
> 
> Regards,
> 
> João Abecasis
> 

I  thought I was only marking the explicit specialization of a single method ( 
eg Normal) for exporting or maybe it's because its not possible to specialize 
just one method.?

After reading your reply I had a look at enable_if but I couldn't figure a way 
to test the DIM
ie

template <typename T> 
explicit Vector( T x, typename boost::enable_if< DIM==1, void*>::type = 0 )
 {
 data_[0]=x; 
 }

but I'm not sure I understand how to use it and am still surfing for examples.

Thanks for the help.

Frank