HAHAHAHA Nevermind. copy_col_if_in_dest<boost::mpl::at<src::typelist, boost::mpl::int_<0>

::type,src::typelist>();

-----Original Message----- From: Brian Braatz Sent: Saturday, June 04, 2005 2:38 PM To: 'boost@lists.boost.org' Subject: ICE ICE BABY! (my MPL code is ICEing)

Sitting in the backyard.

Beautiful day, got up at 3am to get something figured out (for

instead of being src::typelist (which is a ref to the param of type src_t) it needs to be src_t::typelist. it was indeed something stupid- I am undecided as to which is more stupid. The fact that I didn't catch that or the fact that MSVC ICE'd on it...... sorry for bugging you guys proposed

boost profiler \ introspection library).

Good news is I figured out the MPL code needed to accomplish my goal. After typing in an incremental version of the code, I got the dreaded internal compiler error (ICE).

I am chewing on this- and thought I would post it so to provide an opportunity for someone to show how incredibly stupid I am because I did something that was obviously wrong. (you can even rub my nose in it if you like :) )

here is the code:

I am tearing it apart\deconstructing to try to figure out what is kicking in the ICE. (I am also going to try it with an eval_if (which I should be using anyway) just to see what happens)

I am using boost 1.32 and vc7.1

struct do_copy_col { typedef do_copy_col type; do_copy_col() { std::cout << "do_copy_col" << std::endl; } // todo- implement operator()(dest,src) }; struct do_not_copy_col { typedef do_not_copy_col type; do_not_copy_col() { std::cout << "do_not_copy_col" << std::endl; }

// todo- implement operator()(dest,src) };

template <class type_t, class sequence_t> struct copy_col_if_in_dest : public if_< typename is_same< typename deref<typename boost::mpl::find<sequence_t, type_t>::type >::type, type_t>, do_copy_col, do_not_copy_col>::type { };

template <class src_t, class dest_t> void copy_union(src_t & src, dest_t & dest) { copy_col_if_in_dest<boost::mpl::at<src::typelist, boost::mpl::int_<0>

...

::type,src::typelist>(); }