Изменения
→any_iterator
=== polymorphic function wrapper (aka {boost,std}::function) ===
=== any_iterator ===
http://thbecker.net/free_software_utilities/type_erasure_for_cpp_iterators/any_iterator.html
=== boost::any ===
http://learningcppisfun.blogspot.ru/2007/09/boostany.html
