[gmpi] Re: low level API
- From: "gogins@xxxxxxxxxxxx" <gogins@xxxxxxxxxxxx>
- To: gmpi@xxxxxxxxxxxxx
- Date: Fri, 4 Feb 2005 11:41:15 -0500
Of course that would work too.
As for macros, they should be avoided. Period! As long as we're expressing
our personal preferences....
No macros, no invisible namespace collisions, no undebuggable code, no
invisible side effects, no mysteries. Worst thing about C and C++, macros.
Original Message:
-----------------
From: Tim Hockin thockin@xxxxxxxxxx
Date: Fri, 4 Feb 2005 08:15:19 -0800
To: gmpi@xxxxxxxxxxxxx
Subject: [gmpi] Re: low level API
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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