[odb-users] mapping complex, templatized value types

[Christian Sell]

an observation:
 
template instances do not work, neither directly nor through alias or typedef,
e.g.:

using DTA = ::std::shared_ptr<SimpleProperty<std::string>>; //NOT usable

subclassing the template class does work:

class DTA : public ::std::shared_ptr<SimpleProperty<std::string>> {}

this is of course no real solution. I still hope there is a workaround..

Christian

> Andreas Pasternak MT-Robot AG <a.pasternak at mt-robot.com> hat am 19. September
> 2015 um 13:53 geschrieben:
>
>
> Did you try an C++11 type alias?
>
> using SPI = ::std::shared_ptr< ::FlexisBase::SimplePr...
> #pragma db value(SPI ) type("VARCHAR")
>
> ----------------original message-----------------
> From: Christian Sell [christian at gsvitec.com ]
> To: odb-users at codesynthesis.com Date: Sat, 19 Sep 2015 12:38:57 +0200 (CEST)
> -------------------------------------------------
>
>
> > Hello,
> > I am trying to map custom value types using the value_traits
> > approach mentioned
> > in the manual and exemplified in the mapping example from odb-examples. I
> > can
> > succefully map a simple type like:
> >
> > class Data {
> > string something;
> > }
> >
> > but I am failing to map complex templatized types like:
> > ::std::shared_ptr< ::FlexisBase::SimplePropertyImp<
> > ::std::basic_string< char >,
> > ::FlexisBase::NoValidation< ::std::basic_string< char >, 2 >, 2 > >
> >
> > I have defined value_traits for both types, and as I said, the first type is
> > picked up correctly. The second already fails in the
> >
> > #pragma db value(X) type("VARCHAR")
> >
> > line.
> >
> > Question: what restrictions exist with regard to the types that can be
> > mapped
> > using this approach? What can I do to map the second type?
> >
> > thanks,
> > Christian
> >
> >
>
>
> --
>
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Christian Sell

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