[dcom 1.2] Implement dispatch variant marshalling

[Dimitrie O. Paun]

On 4 Sep 2003, Mike Hearn wrote:

> Another possibility is to have a wine convenience macro, similar to the
> glib g_return_if_fail() macro, that works for instance:
> 
> wine_return_if_fail_hr(CoDoSomethingCOMRelated())
> 
> which expands to
> {
>    HRESULT hr = CoDoSomethingCOMRelated()
>    if (hr != S_OK) { ERR("CoDoSomethingCOMRelated() failed, hr=%ld\n",
> hr); return hr;
> }

I still find this ugly, but this is maybe just me. For someone
looking at the code, it's cryptic. This is cleaner I find:

   HRESULT hr = CoDoSomethingCOMRelated();
   if (hr != S_OK) return hr;

And besides, all those errors will bloat the code to such an
extent that we'll be forced to disable ALL tracing, even the
good, hand-written one. The better solution is to make sure
we have a decent way of failing in a function which is already
the case in 99% of cases. No need to generalize and make it
easier to do the wrong thing for the sake of that tiny portion
of code that needs fixing anyway.

-- 
Dimi.