std::default_sentinel_t, std::default_sentinel
From cppreference.com
| Defined in header <iterator>
|
||
| struct default_sentinel_t {}; |
(1) | (since C++20) |
| inline constexpr 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 type default_sentinel_t.[edit] Example
Run this code
#include <print> #include <regex> #include <string> int main() { const std::string s = "Quick brown fox."; const std::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 (const std::smatch& match : words) std::println("{}", match.str()); }
Output:
Found 3 words: Quick brown fox.
[edit] See also
| input iterator that reads from std::basic_istream (class template) | |
| input iterator that reads from std::basic_streambuf (class template) | |
| (C++20) |
iterator adaptor that tracks the distance to the end of the range (class template) |
