Re: [Boost-users] [mpl] Using at_c within find_if

From: Tobias Schwinger (tschwinger_at_[hidden])
Date: 2007-03-28 04:06:30

Christian Henning wrote:
> Hi there, I'm trying to find a solution for looking for type vector
> containing a specific type. On another thread I was suggested to use
> at_c within the find_if algorithm. Unfortunately the code doesn't
> compile.

Placeholder substitution won't work in templates taking non-type 
arguments, such as at_c.

> typedef mpl::find_if<mat, is_same<mpl::at_c<mpl::_1,1>, int> >::type iter;

Try using 'at' and 'int_':

     typedef find_if<mat, is_same<at<_1,int_<1> >, int> >::type iter;

Regards,
Tobias