[odb-users] ODB Support for Boost dynamic_bitset

[Boris Kolpackov]

Hi Jiemin,

Huang Jiemin <hjiemin at dso.org.sg> writes:

> I'm new to ODB and I would like to find out if ODB supports Boost
> dynamic_bitset to any type in MS SQL? I couldn't find any information
> on dynamic_bitset in the documentation.

There is no built-in support for boost::dynamic_bitset. I guess the
most natural database type to map it to is BINARY/BLOB. You can
easily implement this mapping yourself as explained in this article:

http://www.codesynthesis.com/~boris/blog/2012/10/16/custom-cxx-to-database-type-mapping-in-odb/

If you want a quick a dirty solution, then you can map it to string
in the database with a help of a virtual data member, for example:

#pragma db object
class object
{
  ...


  #pragma db transient
  boost::dynamic_bitset<> data_;

  std::string
  data_as_string () const
  {
    std::string s;
    boost::to_string (data_, s);
    return s;
  }

  void
  data_from_string (const std::string& s)
  {
    data_ = boost::dynamic_bitset<> (s);
  }

  #pragma db member(data) virtual(std::string) \
    get(data_as_string) set(data_from_string)
};

Boris