[gmpi] Re: low level API
- From: Tim Hockin <thockin@xxxxxxxxxx>
- To: gmpi@xxxxxxxxxxxxx
- Date: Fri, 4 Feb 2005 08:15:19 -0800
On Fri, Feb 04, 2005 at 10:11:18AM -0500, gogins@xxxxxxxxxxxx wrote:
> To declare a new interface deriving from IUnknown in C, copy the
> IUnknownVirtualFunctionTable declaration, rename it, and add new
> function
Why copy it? Why not just put a struct IUnknown at the head of the
"subclass". You can then cast to IUnknown safely. Or why not make an
INHERIT_IUNKNOWN macro that pastes that signature in, thus avoiding
copy-paste errors?
This is where C falls down. If we could peek inside a member struct,
life
would be better. E.g.:
struct parentclass {
a
b
}
struct subclass {
struct parentclass; /* anonymous */
foo
bar
}
in this case, subclass->a should work. But C is dumb.
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