Hi everyone,
After a period of time of developing with URE, I find the C++ UNO
class Reference is not very comfortable for use sometime.
The problem is, when I have a reference of base interface XA and a
reference of derived interface XB, I can't make xA = xB directly.
Instead I have to query XA from xB like this xA = Reference<XA>::query(xB).
I wonder that whether we can use template constructors to simply this
situation.These constructors may something like this:
template <typename interface_type>
class Reference
{
template <_interface_type>
Reference(const Reference<_interface_type>& rRef)
{
interface_type* p = NULL;
_interface_type* _p = NULL;
p = _p; // compiling time cast check.
_pInterface = iquery( rRef.get() );
}
// copy constructor
Reference(const Reference<_T>& another)
{
...
}
}
Now we can simplify the cast code above to
xA = xB;
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