そのせいでconst_iteratorか否かを判別するのにこんな長ったらしいのが必要になる ._. is_const< typename remove_pointer< typename iterator_pointer< Iterator >::type >::type >
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そのせいでconst_iteratorか否かを判別するのにこんな長ったらしいのが必要になる ._. is_const< typename remove_pointer< typename iterator_pointer< Iterator >::type >::type >