std::experimental::ranges::Readable

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定义于头文件 `<experimental/ranges/iterator>`
template < class In > concept bool Readable = requires { typename ranges::value_type_t<In>; typename ranges::reference_t<In>; typename ranges::rvalue_reference_t<In>; } && ranges::CommonReference< ranges::reference_t<In>&&, ranges::value_type_t<In>& > && ranges::CommonReference< ranges::reference_t<In>&&, ranges::rvalue_reference_t<In>&& > && ranges::CommonReference< ranges::rvalue_reference_t<In>&&, const ranges::value_type_t<In>& >;		(范围 TS)

概念 Readable 为通过应用 operator* 可读的类型，例如指针、智能指针和迭代器所满足。