Hi Martin,
2009/9/5 Martin Beckett <m...@mgbeckett.com>:
> Thanks but not really - then I can't use the new class in the scene graph.
>
Yes, you can, can't you? Pass your objects to constructor. I wouldn't
do it, but you want if you want to.
class MyAdapter
{
typedef osg::ref_ptr<osg::PAT> osg_pat_type;
osg_pat_type m_sppat;
public:
// we'll you use
explicit MyAdapter(osg_pat_type pat) : m_sppat(pat) { }
explicit MyAdapter(PAT* pat) : m_sppat(pat) { }
MyAdapter() : m_sppat(new osg::PAT) { }
osg::PAT* release() { m_sppat.release(); }
osg::ref_ptr<osg::PAT> GetPAT() /*const*/ { return m_sppat; }
// if you want conversions, provide conversion operators...
operator PAT*() { return m_sppat.get(); }
};
Pass your object to constructor and call release before scope ends.
You may automate this by adding a flag and checking that in
destructor. e.g.
const bool m_fShouldRelease;
public:
explicit MyAdapter(osg_pat_type pat) : m_sppat(pat),
m_fShouldRelease(true) { }
explicit MyAdapter(PAT* pat) : m_sppat(pat), m_fShouldRelease(true) { }
MyAdapter() : m_sppat(new osg::PAT), m_fShouldRelease(false) { }
~MyAdapter()
{
if (m_fShouldRelease) release();
}
> The idea was to have a 'location' object in the scenegraph which is a PAT as
> far as OSG is concerned but has methods which reflect the interface I'm used
> to and fit the needs of my problem domain. That I can do with an Adapter
> derived class
>
> It looks like the only way is to have a set of converter functions.
> Unfortunately the naming gets a bit complex because I have an osg::location
> class and a my::location class with the same interface but different
> internals.
You can use namespace aliases, or, typedef your my::location to
something else; it may help.
namespace my = AdapterNS;
typedef AdapterNS::location AdapterLocation;
or
namespace AdapterNS
{
typedef ::my::location AdapterLocation;
}
// use AdapterNS::AdapterLocation.
>
> I think this is one of those areas where C++ falls behind Java or C#
>
> Martin
>
How would you do it in C#? You can do a lot of strange-looking things
in C++, which you can't do in a managed language, because run-time
will not allow you (unless you explicitly express your intent is a
non-verifiable code).
> ------------------
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=17086#17086
>
>
>
>
>
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