#pragma once

#include <type_traits>

template<class T, class = void>
struct is_iterator : std::false_type
{
};

template<class T>
struct is_iterator<T,
    std::void_t<typename std::iterator_traits<T>::difference_type, typename std::iterator_traits<T>::pointer,
        typename std::iterator_traits<T>::reference, typename std::iterator_traits<T>::value_type,
        typename std::iterator_traits<T>::iterator_category>> : std::true_type
{
};

template<class T>
constexpr bool is_iterator_v = is_iterator<T>::value;