std::experimental::ranges::IndirectUnaryInvocable, std::experimental::ranges::IndirectRegularUnaryInvocable
From cppreference.com
 
 
 < cpp | experimental | ranges 
 
 
 C++ 
 Feature test macros (C++20)
 Concepts library (C++20)
 Metaprogramming library (C++11)
 Ranges library (C++20)
 Filesystem library (C++17)
 Concurrency support library (C++11)
 Execution control library (C++26)
Experimental 
 Filesystem library (filesystem TS)
 Library fundamentals (library fundamentals TS)
 Library fundamentals 2 (library fundamentals TS v2)
 Library fundamentals 3 (library fundamentals TS v3)
 Extensions for parallelism (parallelism TS)
 Extensions for parallelism 2 (parallelism TS v2)
 Extensions for concurrency (concurrency TS)
 Extensions for concurrency 2 (concurrency TS v2)
 Concepts (concepts TS)
 Ranges (ranges TS)
 Reflection (reflection TS)
 Mathematical special functions (special functions TR)
Iterators library 
    
 
 
   
    
   
    
 Iterator concepts
 Indirect callable concepts
IndirectUnaryInvocableIndirectRegularUnaryInvocable
 Common algorithm requirements
 Concept utilities
 Iterator utilities and operations
 Iterator traits
 Iterator adaptors
 Stream iterators
Defined in header 
 
 
<experimental/ranges/iterator> 
 template< class F, class I >
 
 (ranges TS) 
concept bool IndirectUnaryInvocable =
    Readable<I> && CopyConstructible<F> &&
    Invocable<F&, ranges::value_type_t<I>&> &&
    Invocable<F&, ranges::reference_t<I>> &&
    Invocable<F&, ranges::iter_common_reference_t<I>> &&
    CommonReference<
        std::result_of_t <F&(ranges::value_type_t<I>&)>,
template< class F, class I >
 
 (ranges TS) 
concept bool IndirectRegularUnaryInvocable =
    Readable<I> && CopyConstructible<F> &&
    RegularInvocable<F&, ranges::value_type_t<I>&> &&
    RegularInvocable<F&, ranges::reference_t<I>> &&
    RegularInvocable<F&, ranges::iter_common_reference_t<I>> &&
    CommonReference<
        std::result_of_t <F&(ranges::value_type_t<I>&)>,
 This section is incomplete
Reason: add description and extra caveats
Reason: add description and extra caveats