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MyASPN >> Mail Archive >> boost
boost
Re: [boost] MPL's "round" lambda
by Peter Dimov other posts by this author
Nov 18 2002 2:17PM messages near this date
[boost] Re: MPL's "round" lambda | Re: [boost] MPL's "round" lambda
From: "Joel de Guzman" <djowel@[...].uk> 
>  From: "Peter Dimov" <pdimov@[...].net>
>  > From: "Aleksey Gurtovoy" <agurtovoy@[...].com>
>  > > If you are tired of angle brackets in your templates (no, it's not a
TV
>  > > commercial :), may be you'll like this one:
>  > >
>  > >     typedef eval<
>  > >           count_if(
>  > >               list(int,char,long,int)
>  > >             , lambda(is_same(_,int))
>  > >             )
>  > >         >::type res;
>  > >
>  > >     BOOST_STATIC_ASSERT(res::value == 2);
>  >
>  > OK, I give up. How does this work?
> 
>  I've been twisting my mind very hard the past hour trying to
>  imagine how this will work without peeking at the code.
>  Whew, this is a tough one to crack!

I wrote "I don't understand how it works even _after_ (briefly) looking at
the code. ;-)" but then it occured to me that list(int, char, long, int) is
a function type. Cool trick. Cv qualifiers will probably be a problem but
it's cool. Aleksey wins the Boost obfuscated C++ contest of the week.

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Peter Dimov
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