std::filesystem::recursive_directory_iterator::disable_recursion_pending(3)

NAME
std::filesystem::recursive_directory_iterator::disable_recursion_pending - std::filesystem::recursive_directory_iterator::disable_recursion_pending

Synopsis
   void disable_recursion_pending(); (since C++17)
   Disables recursion to the currently referred subdirectory, if any.
   The call modifies the pending recursion flag on the iterator in such a way that the
   next time increment is called, the iterator will advance within the current
   directory even if it is currently referring to a subdirectory that hasn't been
   visited.
   The status of the pending recursion flag can be queried with recursion_pending(),
   which is false after this call. It is reset back to true after increment, and its
   initial value is also true.
   The behavior is undefined if *this is the end iterator.

Parameters
   (none)

Return value
   (none)

Exceptions
   May throw implementation-defined exceptions.

Example
// Run this code
 #include <cstdlib>
 #include <fstream>
 #include <iostream>
 #include <string>
 #include <filesystem>
 namespace fs = std::filesystem;
 int main()
 {
     fs::current_path(fs::temp_directory_path());
     fs::create_directories("sandbox/a/b/c");
     fs::create_directories("sandbox/a/b/d/e");
     std::ofstream("sandbox/a/b/file1.txt");
     fs::create_symlink("a", "sandbox/syma");
     std::system("tree sandbox");
     for(auto i = fs::recursive_directory_iterator("sandbox");
              i != fs::recursive_directory_iterator();
            ++i ) {
         std::cout << std::string(i.depth()*2, ' ') << *i;
         if(fs::is_symlink(i->symlink_status()))
             std::cout << " -> " << fs::read_symlink(*i);
         std::cout << '\n';
         // do not descend into "b"
         if(i->path().filename() == "b")
             i.disable_recursion_pending();
     }
     fs::remove_all("sandbox");
 }

Possible output:
 sandbox
 ├── a
 │ └── b
 │ ├── c
 │ ├── d
 │ │ └── e
 │ └── file1.txt
 └── syma -> a
 "sandbox/a"
   "sandbox/a/b"
 "sandbox/syma" -> "a"

See also
   recursion_pending checks whether the recursion is disabled for the current directory
                     (public member function)
   increment advances to the next entry
   operator++ (public member function)