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

On 3/28/07, Tobias Schwinger <tschwinger@isonews2.com> wrote:

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

I am curious why at_c doesn't do the same thing. Shouldn't these be equivalent. Chris