Re: VS 2003 generating duplicate COMDAT for template instantiation?

I'm curious where Field is defined, and if the compiler can understand
it is a type.

Im thinking something like this might work... but my templates are rusty

template<class T>
{
 typedef typename T* FieldPtr

} Container;

And a pointer being passed as:

Container<pit::FloatTriple>(core_->ambientlight_[l])

The other template being

template<class Field, class C = Container<Field> >

class FieldAccessor
{
  typedef C::FieldPtr TypePtr;

  FieldAccessor(TypePtr &t) :MyTypePtr(t) {}

// accessor returns &MyTypePtr

  TypePtr &MyTypePtr;

}

Anyway, good luck :p

Matthew

>
> I'm trying to generate a SAS parser/binder using just a little bit of
> template programing, and I'm running into the following link error (I'm
> using VS 2003). I would like any help I can get in how to work around
> this problem. I got it when I was reinterpret_cast-ing from type
> Foo::*Bar[N] to Foo::*Bar[], but I worked around that by explicitly
> passing in the array size. However, here there are no skanky casts
> involved; this should "just work." (And I've tried with and without the
> inline Access() function).
>
>
> Win32DX9Graphics.obj : fatal error LNK1179: invalid or corrupt file:
> duplicate COMDAT
> '?Access@?$FieldAccessor@USasAmbientLight@impl_DX9@@VFastTriple@pit@@$GA@A@A@@impl_DX9@@QAEABVFastTriple@pit@@ABUSasAmbientLight@2@@Z'
>
> Looking at the templates FieldAccessor, here is the code:
>
>
> template<typename Container, typename Type, Type Container::*Field>
> class FieldAccessor {
>   public:
>     typedef Container ContainerType;
>     typedef Type FieldType;
>     inline Type const &Access(Container const &c) { return c.*Field; }
> };
>
>
> Here are the two cases where FieldAccessor<> is referenced for the
> SasAmbientLight:
>
>
>       //  dispatch the child
>       if (!wcscmp(path, L"color")) {
>         setter_ = PIT_SYSTEMNEW0("ValueSetter") ValueSetter<
>             FieldAccessor<SasAmbientLight, pit::FloatTriple,
> &SasAmbientLight::color> >
>             (this, core_->ambientlight_[l]);
>         return true;
>       }
>       return false;
>
> ...
>
>       //  dispatch the child, then return an iterator on that
>       if (!wcscmp(path, L"color")) {
>         setter_ = PIT_SYSTEMNEW0("OuterArraySetter") OuterArraySetter<
>             FieldAccessor<SasAmbientLight, pit::FloatTriple,
> &SasAmbientLight::color> >
>             (this, core_->ambientlight_, &core_->numambientlights_.get());
>         return true;
>       }
>       return false;
>
>
>
> pit::FloatTriple is what you'd expect, as is struct SasAmbientLight:
>
> struct SasAmbientLight {
>   pit::FloatTriple      color;
> };
>
>
>
> Btw: upgrading to 2005 isn't the preferred solution right now.
>
>
>
>
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-- 
-----
Matt Johnson
http://otowngraphics.blogspot.com

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