Re: [Boost-users] Problem with 'cannot instantiate abstract class' after switching from BOOST 1.33.0 to 1.34.1 (also VS2005 -> VS2008)

13 Mar 2009

      AMDG

I've tried to strip the error message down to the important parts.

Tobias Alte wrote:
...
Generally speaking we would have the following structure:
Axis [pure virtual, abstract]
{
}
----------------------------------------------------------------------
[...]\boost\concept_check.hpp(250) : error C2259: 
'MotionControl::Axis': cannot instantiate abstract class due to 
following members:
[...]\include\dataobject.h(747) : see reference to class template 
instantiation 'boost::CopyConstructibleConcept<TT>' being compiled
with
[
    TT=MotionControl::Axis
]
[...]\include\dataobject.h(1444) : see reference to class template 
instantiation 'Data<_type>' being compiled
with
[
    _type=MotionControl::Axis
]
Why does Data require _type to be CopyConstructible?
If this concept requirement is correct, why is Data being
instantiated with MotionControl::Axis?

In Christ,
Steven Watanabe