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    std::experimental::ranges:: indirect_result_of

    From de.cppreference.net
    C++
    Experimental
    Ranges
    Iterators library
    Iterator concepts
    Indirect callable concepts
    Common algorithm requirements
    Concept utilities
    indirect_result_of
    Iterator utilities and operations
    Iterator traits
    Iterator adaptors
    Stream iterators
    template < class > struct indirect_result_of { } ;


    template < class F, class ... Is >
    requires Invocable < F, ranges :: reference_t < Is > ... >
    struct indirect_result_of < F ( Is... ) >

    : std:: result_of < F ( ranges :: reference_t < Is > && ... ) > { } ;
    		(ranges TS)