Re: [pclasses-devel] Rewrite of Factory and PluginManager

[Prochnow, C. <pro...@se...>]

Am Freitag 27 Mai 2005 19:09 schrieb stephan beal:
> On Friday 27 May 2005 16:46, Prochnow, Christian wrote:
> > but when using type_info::name().. the type_info object returns the
> > mangled c++ ABI name of the type which _must_ be the same in all
> > compilation units.
> >
> > see this: http://gnu.open-mirror.com/software/gcc/faq.html#dso
>
> i wish the GCC guys would all read that. ;) i will swear on my life i've
> seen type_info::name() returns two different strings for the same type,
> depending on their creation scope. That was way back in 3.0/3.1, too,
> so maybe it doesn't happen anymore.
>
> In any case that page only applies to gcc. According to C++, what name()
> returns is UNDEFINED. Scott Meyers covers this in detail in one of his
> books. The way he puts it, even an implementation in which name()
> returns an empty string for every class is fully compliant with the
> standard. Not useful, but compliant.

i will keep that in mind for further investigation...

> > i think we can make the second argument a const reference type.
>
> That still requires instantiating it, a limitation i haven't ever needed
> in a factory implementation.

i've added a second Factory::registerType method which does not require 
constructing a temporary object. One could also use Factory::registerFactory 
like in your old implementation.

Btw... you're old Factory implementation did also require constructing a 
temporary object ;-)

see Factory.h Revision 1.21:
--
template <typename TypeName>
void registerType( const key_type & key, TypeName )
{
   registerFactory( key, 
Hook::FactoryCreateHook<InterfaceT,TypeName>::create );
}


Greetings,

Christian