std::experimental::ranges::SizedRange

来自cppreference.com
在标头 <experimental/ranges/range> 定义
template< class T >
concept bool SizedRange =
    Range<T> &&
    !ranges::disable_sized_range<std::remove_cv_t<std::remove_reference_t<T>>> &&
    requires(T& t) {
        { ranges::size(t) } 
            -> ConvertibleTo<ranges::difference_type_t<ranges::iterator_t<T>>>;
    };
(范围 TS)