"Robin Lee" <robinlee.s...@gmail.com>:
> I am playing GIRepository with G::O::I.
> I get a GIRepository::BaseInfo object from gir get_info funtion.
> One question is how to test whether this object is a 
> GIRepository::CallableInfo.
> And another question is how to cast this object to a 
> GIRepository::CallableInfo.

For a normal GObject-based library, the C hierarchy would be mapped to Perl 
package hierarchy so that you could use $object->isa('Package') and so that 
casting wouldn't be necessary.

But GIRepository is not a GObject-based library, so you're basically in 
uncharted territory here Glib::Object::Introspection has not been written and 
tested with this application in mind.  But try calling ->get_type() on the 
GIRepository::BaseInfo object.  Once you know the type, try calling child class 
methods fully-qualified, for example:

  GIRepository::Struct::find_method ($base_info_which_is_struct_info, $name)

Also, have a look at what 'perli11ndoc' presents for GIRepository to maybe get 
a better idea of what is possible.  (The calling syntax presented might, 
however, not be correct, because 'perli11ndoc' also assumes GObject semantics.)

Might I ask what you are trying to accomplish with the information from 

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