[odb-users] Simple Raw Pointer Container

[Sachin Kumar]

Greetings,

I'm relatively new to ODB, so there likely is a simple solution to my
problem. As outlined in the sample below, I have two classes: MyHolder and
MyElement. MyHolder has a std::vector of MyElement.

The code below works and I get the appropriate tables in my database,
namely myholder and myholder_myelement. However, if I change the
std::vector to be a vector of MyElement pointers, it doesn't work. I get a
"error: unable to map C++ type" error from the ODB compiler.

I've tried several things to fix this:

1. Use #pragma db object instead of #pragma db value for MyElement. This
seems fix the ODB compile problem, except that the myholder_myelement table
now contains the actual pointer value, which isn't at all useful. Is this
expected?

2. I've also tried using boost::shared_ptr, thinking that perhaps using raw
pointers causes problems, but to no avail.

What's the right way to do this?


class MyElement;

#pragma db object
#pragma db model version(1, 1, open)
class MyHolder
{
...
private:
friend class odb::access;

// some members

std::vector<MyElement> elements;
};

#pragma db value
class MyElement
{
...
private:
friend class odb::acess;

// some members
};