Hey Jan,
2011/1/8 Jan Köster <[email protected]>:
> i have solve this problem now i have problem with this template:
>
> template<>
> struct Wt::Dbo::dbo_traits<Twitter> : public Wt::Dbo::dbo_default_traits {
> static const char *versionField() {
> return 0;
> }
> };
>
> i got from gcc this:
> In file included from
> /local/administrator/projects/tuxist/twitter/src/twitter.cpp:21:
> /local/administrator/projects/tuxist/twitter/src/twitter.h:79: error:
> specialization of ‘Wt::Dbo::dbo_traits<Twitter>’ after instantiation
> /local/administrator/projects/tuxist/twitter/src/twitter.h:79: error:
> redefinition of ‘struct Wt::Dbo::dbo_traits<Twitter>’
> /usr/include/Wt/Dbo/ptr:207: error: previous definition of ‘struct
> Wt::Dbo::dbo_traits<Twitter>’
> make[2]: *** [src/CMakeFiles/twitter.fcgi.dir/twitter.o] Fehler 1
> make[1]: *** [src/CMakeFiles/twitter.fcgi.dir/all] Fehler 2
> make: *** [all] Fehler 2
>
> what is the problem ?
In C++, a template specialization (like the one you define here of
dbo_traits for Twitter), needs to be declared before the template is
first used.
Thus, your template specialization itself is fine, but you need to
move it preceding any reference of class Twitter. Thus:
class Twitter;
namespace Wt {
namespace Dbo {
..
}
}
class Twitter : public ...
{
}
See also example/feature/dbo/tutorial5.C
Regards,
koen
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