how to detect if a type is an iterator or const_iterator

Question

I\'m wondering, if there is a way to check at compile time whether a type T of some iterator type is a const_iterator, or not. Is there some difference in the types that ite

Answer 1

C++11

template())>    
constexpr bool  
is_const_iterator() {   
        return  ! std::is_assignable <
                decltype( *std::declval() ),
                T   
        >::value;
}