translating "setattr" to C++

[Eric]

Slightly off topic, i know, but here goes:

I'm trying to xlate a module of mine to C++. Only problem is, it makes
heavy use of "setattr". Anyone know a straightforward way to do
"setattr" in C++ ?

thanks,
Eric

[Peter Hansen]

Re: translating "setattr&q uot; to C++

Eric wrote:
[color=blue]
> Slightly off topic, i know, but here goes:
>
> I'm trying to xlate a module of mine to C++. Only problem is, it makes
> heavy use of "setattr". Anyone know a straightforward way to do
> "setattr" in C++ ?[/color]

Thinking about what setattr() does, and about how C++ works, I suspect
there is no straightforward way. There _might_ be some existing library
for introspection that can do something resembling what you want.

Think about it: setattr() uses the names of arbitrary (possibly
non-existing, but of course you can't solve that in C++ at all)
attributes that are contained in strings. That means the resolution is
done at run-time. In C++, on the other hand, all the names pretty much
vanish at compile-time, so unless you prepare mappings of some kind
ahead of time, or have a package which can read dynamically from header
files or something, you're plain screwed. AFAICS.

-Peter

[Dan Bishop]

Re: translating "setattr&q uot; to C++

Eric <eric@lentil.co m> wrote in message news:<87oeqtkru w.fsf@subopt.au stin.rr.com>...[color=blue]
> Slightly off topic, i know, but here goes:
>
> I'm trying to xlate a module of mine to C++. Only problem is, it makes
> heavy use of "setattr". Anyone know a straightforward way to do
> "setattr" in C++ ?[/color]

No, but there's a workaround.

Instead of referring to the fields of an object as, for example, x.foo
and x.bar, store your object's data in a hash table with "foo" and
"bar" as keys.

[Thomas Heller]

Re: translating &quot;setattr&q uot; to C++

danb_83@yahoo.c om (Dan Bishop) writes:
[color=blue]
> Eric <eric@lentil.co m> wrote in message news:<87oeqtkru w.fsf@subopt.au stin.rr.com>...[color=green]
>> Slightly off topic, i know, but here goes:
>>
>> I'm trying to xlate a module of mine to C++. Only problem is, it makes
>> heavy use of "setattr". Anyone know a straightforward way to do
>> "setattr" in C++ ?[/color]
>
> No, but there's a workaround.
>
> Instead of referring to the fields of an object as, for example, x.foo
> and x.bar, store your object's data in a hash table with "foo" and
> "bar" as keys.[/color]

You could even store the hash table as a __dict__ instance variable in
your C++ object. And use a PyDict_Object instead of the has table.

;-)

Thomas