Hello Boosters,
I am trying to use dynamic_any to store either objects or pointers to
(polymorphic) objects.
I am able to extract a pointer to the base class of a contained object:
class B { };
class D: public B { };
void Test()
{
any d(D());
B* pb = extract<B>(&d);
}
This is alread quite useful. However the following code does not work:
void Test2()
{
D d;
any pd(&d);
B* pb = extract<B*>(pd); // pb = 0
char c;
any AnyChar(c);
int i = extract<int>(AnyChar); // bad_extract
}
So I have to know the exact type of the contained object and cannot
rely on implicit conversions (D* -> B* or char -> int) to work.
This is quite understandable from the fact that any wraps non-class
types into unrelated classes.
Now my question: is there a way to make these implicit conversions work?
My best answer at the moment: explicitly register conversion functions
from one type to the other in a map<pair<type_info const&, type_info const&>, void*
(*)(void*)>
and look up the right function based on the type contained and the
type requested.
But there has to be a better way, hasn't it?
Best regards.
--Remy
Remove anti-spam sequence in reply address for a timely response.
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