std::experimental::ranges::IndirectUnaryInvocable, std::experimental::ranges::IndirectRegularUnaryInvocable
From cppreference.com
                    
                                        
                    < cpp | experimental | ranges
                    
                                                            
                    | Defined in header  <experimental/ranges/iterator> | ||
| template <class F, class I> concept bool IndirectUnaryInvocable = | (ranges TS) | |
| template <class F, class I> concept bool IndirectRegularUnaryInvocable = | (ranges TS) | |
| This section is incomplete Reason: add description and extra caveats |