id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
4621,"Feature Request: add some version of ""type erasure"" range/iterator",Ilya Murav'jov <muravev@…>,Neil Groves,"Hi!
 I successfully use B.Lambda/B.Function for closure functionality in my code and would like to do the same with complex iterators/ranges . I've successfully implemented such ""any"" iterator range on top of any_iterator ( thanks to http://thbecker.net/free_software_utilities/type_erasure_for_cpp_iterators/start_page.html ), see [[http://gitorious.org/bombono-dvd/bombono-dvd/blobs/master/src/mlib/range/any_range.h|any_range.h]] . The common use case is as follows (my real code, [[http://gitorious.org/bombono-dvd/bombono-dvd/blobs/master/src/mgui/editor/select.cpp|select.cpp]]):

{{{#!c++
  fe::range<Comp::MediaObj*> SelectedMediaObjs(MenuRegion& mn_rgn, const int_array& sel_arr)
  {
      return fe::make_any( sel_arr | fe::transformed(ToMOTransform(mn_rgn)) );
  }
  fe::range<Comp::MediaObj*> SelectedMediaObjs(MEditorArea& edt_area)
  {
      return SelectedMediaObjs(edt_area.CurMenuRegion(), edt_area.SelArr());
  }

  ...
  // somewhere else
  ...
  BOOST_FOREACH( Comp::MediaObj* obj, SelectedMediaObjs(edt_area) )
  {
      res_mi = obj->MediaItem();
      break;
  }
}}}
",Patches,closed,To Be Determined,range,Boost 1.44.0,Not Applicable,fixed,,muravev@…