|  | 
| template<typename I > requires input_or_output_iterator<I>
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| constexpr I | operator() (I it) const | 
|  | 
| template<typename I > requires input_or_output_iterator<I>
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| constexpr I | operator() (I it, iter_difference_t< I > n) const | 
|  | 
| template<typename I , typename S > requires sentinel_for<S, I>
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| constexpr I | operator() (I it, iter_difference_t< I > n, S bound) const | 
|  | 
| template<typename I , typename S > requires sentinel_for<S, I>
 | 
| constexpr I | operator() (I it, S s) const | 
|  |