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      std::default_sentinel_t,std::default_sentinel

      From cppreference.com
      <cpp‎ |iterator
       
       
      Iterator library
      Iterator concepts
      Iterator primitives
      Algorithm concepts and utilities
      Indirect callable concepts
      Common algorithm requirements
      (C++20)
      (C++20)
      (C++20)
      Utilities
      (C++20)
      Iterator adaptors
      default_sentinel_tdefault_sentinel
      (C++20)(C++20)
      Range access
      (C++11)(C++14)
      (C++14)(C++14)  
      (C++11)(C++14)
      (C++14)(C++14)  
      (C++17)(C++20)
      (C++17)
      (C++17)
       
      Defined in header<iterator>
      struct default_sentinel_t{};
      		 (1)(since C++20)
      inlineconstexpr default_sentinel_t default_sentinel{};
      		 (2)(since C++20)
      1)default_sentinel_t is an empty class type used to denote the end of a range. It can be used together with iterator types that know the bound of their range (e.g.,std::counted_iterator).
      2)default_sentinel is a constant of typedefault_sentinel_t.

      [edit]Example

      Run this code
      #include <print>#include <regex>#include <string> int main(){conststd::string s="Quick brown fox."; conststd::regex words_regex("[^\\s]+");const std::ranges::subrange words(std::sregex_iterator(s.begin(), s.end(), words_regex), std::default_sentinel); std::println("Found {} words:", std::ranges::distance(words));for(conststd::smatch& match: words)std::println("{}", match.str());}

      Output:

      Found 3 words:Quickbrownfox.

      [edit]See also

      input iterator that reads fromstd::basic_istream
      (class template)[edit]
      input iterator that reads fromstd::basic_streambuf
      (class template)[edit]
      iterator adaptor that tracks the distance to the end of the range
      (class template)[edit]
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