[boost] Re: mpl apply_if.hpp question

From: Larry Evans (cppljevans_at_[hidden])
Date: 2004-10-12 22:23:19

On 09/13/2004 12:37 PM, Robert Ramey wrote:
> Would someone have a fit if something like this were added to boost/mpl ?
[snip]
> // apply_if is deprecated.  Use eval_if instead.  This is only included
> // to support older code like spirit 1.6
> 
> #ifndef BOOST_MPL_APPLY_IF_HPP_INCLUDED
> #define BOOST_MPL_APPLY_IF_HPP_INCLUDED
> 
> #include "boost/mpl/eval_if.hpp"
> 
> namespace boost {
> namespace mpl {
> 
> template<
>       typename C
>     , typename F1
>     , typename F2
>     >
> struct apply_if
> {
>     typedef BOOST_DEDUCED_TYPENAME eval_if<C,F1,F2>::type type;
> };
> 

I tried a global replace of apply_if with eval_if; however, I got:
<--------------------

intel-linux.compile.c++ 
../../../../bin.v2/lje/libs/managed_ptr/test/intel-linux/debug/smart_ptr_test.o
../../../boost/managed_ptr/smart_ptr.hpp(204): error: class 
"boost::mpl::eval_if<boost::mpl::bool_<false>::type, 
boost::mpl::identity<boost::ref_counted<boost::mpl::_>>, 
boost::detail::get_policy<boost::mpl::list<boost::managed_ptr::refcycle_counted_curry_prox_visitor<boost::managed_ptr::refcycle_prox_visitor_abs::this_type>::owner_refptr<boost::mpl::_>, 
boost::empty_policy, boost::empty_policy, boost::empty_policy, 
boost::mpl::na, boost::mpl::na, boost::mpl::na, boost::mpl::na, 
boost::mpl::na,
           boost::mpl::na, boost::mpl::na, boost::mpl::na, 
boost::mpl::na, boost::mpl::na, boost::mpl::na, boost::mpl::na, 
boost::mpl::na, boost::mpl::na, boost::mpl::na, boost::mpl::na>, 
boost::ownership_policy_tag, boost::ref_counted<boost::mpl::_>>::iter_>" 
has no member "type"
               >::type type;
                  ^
           detected during:
             instantiation of class "boost::detail::get_policy<Sequence, 
Category, Default> [with 
Sequence=boost::mpl::list<boost::managed_ptr::refcycle_counted_curry_prox_visitor<boost::managed_ptr::refcycle_prox_visitor_abs::this_type>::owner_refptr<boost::mpl::_>, 
boost::empty_policy, boost::empty_policy, boost::empty_policy, 
boost::mpl::na, boost::mpl::na, boost::mpl::na, boost::mpl::na, 
boost::mpl::na, boost::mpl::na, boost::mpl::na, boost::mpl::na, 
boost::mpl::na, boost::mpl::na,
                       boost::mpl::na, boost::mpl::na, boost::mpl::na, 
boost::mpl::na, boost::mpl::na, boost::mpl::na>, 
Category=boost::ownership_policy_tag, 
Default=boost::ref_counted<boost::mpl::_>]" at line 225

 >----------------

I've searched mail archives for apply_if and eval_if and looked at:

   http://www.boost.org/libs/mpl

as directed by comments in eval_if.hpp; however, none were any help
except the one I'm replying to.

How does one replace apply_if with eval_if to avoid the above error
message.

TIA.

Regards,
Larry