[C++-sig] len(list())?

[David Abrahams]

----- Original Message ----- 
From: "Ralf W. Grosse-Kunstleve" <rwgk at yahoo.com>
To: <c++-sig at python.org>
Sent: Wednesday, July 03, 2002 9:34 AM
Subject: Re: [C++-sig] len(list())?


> --- David Abrahams <david.abrahams at rcn.com> wrote:
> > It works if you substitute "object" for "dictionary", as I suggested.
> 
> Yes, indeed. Thanks.
> 
> The context:
> 
>         // restore the object's __dict__
>         object odict(mydict);
>         object pdict(state_[0]);
>         list pkeys(dictionary(mydict).keys());
>         for(std::size_t i=0;i<len(pkeys);i++) {
>           odict[pkeys[i]] = pdict[pkeys[i]];
>         }
> 
> What can be said about
> 
> odict[pkeys[i]] = pdict[pkeys[i]];
> 
> versus
> 
> object k(pkeys[i]);
> odict[k] = pdict[k];

Not much. Mostly that the latter is more-efficient.
But why don't you rewrite the whole thing:

    odict.attr("update")(pdict);

When we have a dict class you'll be able to write

    odict.update(pdict)

Isn't it nice to be able to write Python in C++ <.002 wink>?

-Dave