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std::default_sentinel_t, std::default_sentinel

From cppreference.com
< cpp‎ | iterator
 
 
Iterator library
(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)
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) [edit]
input iterator that reads from std::basic_streambuf
(class template) [edit]
iterator adaptor that tracks the distance to the end of the range
(class template) [edit]
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