From: Aleksey Gurtovoy (agurtovoy_at_[hidden])
Date: 2005-07-28 01:01:02
Brian Braatz writes:
> Either something strange is happening with arg<> and transform or I did
> not write this code correctly. ( :) )
The latter :).
[...]
> typedef mpl::transform
> <
> vec_t,
> mpl::if_
> <
> boost::is_same<mpl::_1, A >,
> YES< mpl::_1 >::type,
^^^^^^
> NO< mpl::_1 >::type
^^^^^^
> >::type
^^^^^^^
>>::type result;
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;
instead.
HTH,
-- Aleksey Gurtovoy MetaCommunications Engineering