AW: [odb-users] reuse inheritance with templated base class

[Marcel Nehring]

Hi Boris,

thanks for elaborating on the matter.

Thanks for the bug fix, too. I changed traits.hxx as you suggested and it works now.

Unfortunately I ran into another problem. Do I have to take special care when using a member which is mapped to a column of type BLOB when using it with a polymorphic base class? The example code I added below is giving me a compile error stating that "struct 'odb::access::object_traits_impl<Derived,id_oracle>::image_type'" has no applicable copy-constructor. Without the polymorphic base it compiles.

Thanks,
	Marcel

######

#include <vector>

#pragma db object polymorphic
class Base
{
public:
    #pragma db id auto
    int id;

    virtual void foo() const = 0;
};

#pragma db object
class Derived : public Base
{
public:
    #pragma db type("BLOB")
    std::vector<unsigned char> m_payload;
};