LWG3719 Directory iterators should be usable with default sentinel

Author: burblebee

source/iostreams.tex

@@ -15646,6 +15646,10 @@
     directory_iterator&    operator++();
     directory_iterator&    increment(error_code& ec);
 
+    bool operator==(default_sentinel_t) const noexcept {
+      return *this == directory_iterator();
+    }
+
     // other members as required by \ref{input.iterators}, input iterators
   };
 }
@@ -15892,6 +15896,10 @@
     void pop(error_code& ec);
     void disable_recursion_pending();
 
+    bool operator==(default_sentinel_t) const noexcept {
+      return *this == recursive_directory_iterator();
+    }
+
     // other members as required by \ref{input.iterators}, input iterators
   };
 }

source/regex.tex

@@ -3228,6 +3228,7 @@
       regex_iterator(const regex_iterator&);
       regex_iterator& operator=(const regex_iterator&);
       bool operator==(const regex_iterator&) const;
+      bool operator==(default_sentinel_t) const { return *this == regex_iterator(); }
       const value_type& operator*() const;
       const value_type* operator->() const;
       regex_iterator& operator++();
@@ -3533,6 +3534,7 @@
       regex_token_iterator(const regex_token_iterator&);
       regex_token_iterator& operator=(const regex_token_iterator&);
       bool operator==(const regex_token_iterator&) const;
+      bool operator==(default_sentinel_t) const { return *this == regex_token_iterator(); }
       const value_type& operator*() const;
       const value_type* operator->() const;
       regex_token_iterator& operator++();