std::experimental::ranges::Readable

從 cppreference.com

在標頭 `<experimental/ranges/iterator>` 定義
template< class In > concept bool Readable = requires { typename ranges::value_type_t<In>; typename ranges::reference_t<In>; typename ranges::rvalue_reference_t<In>; } && CommonReference<ranges::reference_t<In>&&, ranges::value_type_t<In>&> && CommonReference<ranges::reference_t<In>&&, ranges::rvalue_reference_t<In>&&> && CommonReference<ranges::rvalue_reference_t<In>&&, const ranges::value_type_t<In>&>;		(範圍 TS)

概念 Readable 為通過應用 operator* 可讀的類型，例如指針、智能指針和迭代器所滿足。