std::filesystem::recursive_directory_iterator::disable_recursion_pending

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 directly 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

(none).

Example

#include <fstream>
#include <iostream>
#include <string>
#include <filesystem>
namespace fs = std::filesystem;
 
int main()
{
    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");
    for(auto i = fs::recursive_directory_iterator("sandbox");
             i != fs::recursive_directory_iterator();
           ++i ) {
        std::cout << std::string(i.depth(), ' ') << *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");
}

Output:

"sandbox/a"
 "sandbox/a/b"
"sandbox/syma" -> "a"

See also

checks whether the recursion is disabled for the current directory
(public member function)
advances to the next entry
(public member function)

© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
http://en.cppreference.com/w/cpp/filesystem/recursive_directory_iterator/disable_recursion_pending