[C++-sig] Regression in Boost.Python v1.33

[David Abrahams]

"Niall Douglas" <s_sourceforge at nedprod.com> writes:

> The TnFOX Python bindings are failing to compile on MSVC7.1 in BPL 
> v1.33 when they worked in v1.32:
>
> D:\Tornado\Tn\TClient\boost\boost\python\converter\registered.hpp(88) 
> : error C2784: 'const boost::python::converter::registration 
> &boost::python::converter::detail::registry_lookup(T &(__cdecl 
> *)(void))' : could not deduce template argument for 'T1 &(__cdecl 
> *)(void)' from 'volatile const boost::add_reference<T>::type (__cdecl 
> *)(void)'
>
> I see some changes have been made in converter/registered.hpp, 
> namely:
>
>   template <class T>
>   registration const& registered_base<T>::converters
>      = registry::lookup(type_id<T>());
>
> ... has become:
>
>   template <class T>
>   registration const& registered_base<T>::converters = 
> detail::registry_lookup((T(*)())0);
>
> Is this known about, 

No, all the tests passed for vc7.1 upon release of 1.33.0, so it's
surprising to see a problem here.  Do you have any idea what T is in
this case?  A full instantiation backtrace might help.

> and why was it done when the old code seems 
> perfectly fine?

According to cvs annotate and cvs log, it was:

  revision 1.6
  date: 2005/05/16 14:54:12;  author: david_abrahams;  state: Exp;  lines: +8 -24
  Workarounds for vc6 and 7.

> Cheers,
> Niall

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com