[odb-users] Custom pointer as in pointer-traits.hxx

[Andreas Pasternak MT-Robot AG]

Ok, I figured it out. I tried to create a pointer of a db value (an
int exactly) and not an db object.
Now everything works without any problems.

----------------original message-----------------
From: Andreas Pasternak MT-Robot AG [a.pasternak at mt-robot.com  ]
To: odb-users at codesynthesis.com  Date: Wed, 16 Sep 2015 11:15:22 +0200
-------------------------------------------------


> Hello all,
>
> A third party framework uses a custom pointer. So I tried to create   
> a simple example:
>
> template
> class mypointer {
> public:
>   T* ptr;
> };
>
> I tried then according to the manual but also as a hack directly in   
> pointer-traits.hxx to insert:
>
> namespace odb
> {
> template
>   class pointer_traits >
>   {
>   public:
>   static const pointer_kind kind = pk_unique;
>   static const bool lazy = false;
>
>   typedef T element_type;
>   typedef mypointer pointer_type;
>   typedef mypointer const_pointer_type;
>   typedef smart_ptr_guard
>   guard;
>   };
> } //end odb
>
> I then get the error message:
>
>   error: unable to map C++ type '::mypointer' used in data member    
> 'myptr' to a MySQL database type
>
> Other pointers (std::shared_ptr etc.) work. I also tried to   
> copy&past the std::shared_ptr code and adapt it, leaving it as close  
>  to the  original as possible. I just have no clue why it does not   
> find my  template spezialisation.
>
> But it does compile it, if I have an error in the code it complains.  
>  Also my container specialisation and string specialisation I made   
> work flawlessly. I just don't get the pointers to work.
>
> Thank you,
>
> Andreas
>


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