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    std::experimental::ranges:: Readable

    From ja.cppreference.net
    C++
    Experimental
    Ranges
    Iterators library
    Iterator concepts
    Indirect callable concepts
    Common algorithm requirements
    Concept utilities
    Iterator utilities and operations
    Iterator traits
    Iterator adaptors
    Stream iterators
    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 > & > ;
    		(ranges TS)

    Readableという概念は、 operator*を適用することで読み取り可能な型（ポインタ、スマートポインタ、イテレータなど）によって満たされます。