[boost] [iterator] Proposal to add is_const_iterator trait

Hello, Quite often I find myself writing an is_const_iterator trait which looks like this: //! A helper traits to check if an iterator is const template< typename ItT > struct is_const_iterator : public is_const< typename remove_reference< typename iterator_reference< ItT >::type >::type > { }; Maybe it is worth adding to Boost.Iterators library? Or maybe there already is something like that? -- Best regards, Andrey mailto:andysem@mail.ru