# std::counted_iterator<I>::count

From cppreference.com
< cpp‎ | iterator‎ | counted iterator

constexpr std::iter_difference_t<I> count() const noexcept; |  | (since C++20)

Returns the underlying length that is the distance to the end.

### Parameters

(none)

### Return value

the underlying length.

### Example

Run this code

    #include <iostream>
    #include <iterator>

    int main()
    {
        constexpr static auto il = { 1, 2, 3, 4, 5 };
        constexpr std::counted_iterator i1{il.begin() + 1, 3};
        static_assert(i1.count() == 3);
        for (auto i2{i1}; std::default_sentinel != i2; ++i2)
            std::cout << *i2 << ' ';
        std::cout << '\n';
    }

Output:

    2 3 4

### See also

base (C++20) | accesses the underlying iterator (public member function)

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