Re: [boost] MPL:Possible Placeholder problem with transform & if_(?)

From: Brian Braatz (brianb_at_[hidden])
Date: 2005-07-28 15:36:59

On Behalf Of Aleksey Gurtovoy
> Brian Braatz writes:
> > Either something strange is happening with arg<> and transform or I
did
> > not write this code correctly. ( :) )
> 
> The latter :).
> By requesting '::type' on a metafunction you are immediately
> instantiating it with the placeholder argument(s), which is not what
> you want. Try
> 
>     typedef mpl::transform<
>           vec_t
>         , mpl::if_<
>               , boost::is_same<mpl::_1,	A>
>               , YES< mpl::_1 >
>               , NO< mpl::_1 >
>               >
>         >::type result;
> 

[Brian Braatz Writes:] 
THANK YOU - This is very helpful (in many ways) 

:)