From: Larry Evans (cppljevans_at_[hidden])
Date: 2006-10-21 15:17:51
On 10/21/2006 11:11 AM, Larry Evans wrote:
[snip]
> Sorry for noise. I still need to reread the docs and
> experiment before I understand how bind works.
The following works:
template
< unsigned I
>
struct a
{};
struct f4
{
template< typename T1, typename T2, typename T3, typename T4 >
struct apply
{
typedef vector<T1,T2,T3,T4> type;
};
};
MPL_TEST_CASE() // partially bound metafunction classes
{
typedef bind4<f4, a<1>,a<2>,_1,_2 > f4_a1_a2;
typedef apply_wrap2<f4_a1_a2, a<3>,a<4> >::type f4_a1_a2_a3_a4;
MPL_ASSERT((
boost::is_same<f4_a1_a2_a3_a4,vector<a<1>,a<2>,a<3>,a<4> > > ));
}
So, apparently, the n in apply_wrapn is >= max placeholder arg
in the bind args. Rereading boost.bind, I now see the
similarity. Sorry for the noise, but further examples
like the f4 example above would have helped.