std::filesystem::begin(recursive_directory_iterator), (3) - Linux Manuals

std::filesystem::begin(recursive_directory_iterator),: std::filesystem::begin(recursive_directory_iterator),

NAME

std::filesystem::begin(recursive_directory_iterator), - std::filesystem::begin(recursive_directory_iterator),

Synopsis

recursive_directory_iterator begin( recursive_directory_iterator   (1) (since C++17)
iter ) noexcept;
recursive_directory_iterator end( const                            (2) (since C++17)
recursive_directory_iterator& ) noexcept;

1) Returns iter unchanged
2) Returns a default-constructed recursive_directory_iterator, which serves as the
end iterator. The argument is ignored.

These non-member functions enable the use of recursive_directory_iterators with
range-based for loops.

Parameters

iter - a recursive_directory_iterator

Return value

1) iter unchanged
2) End iterator (default-constructed recursive_directory_iterator)

Example

// Run this code

 #include <fstream>
 #include <iostream>
 #include <filesystem>
 namespace fs = std::filesystem;

 int main()
 {
  fs::create_directories("sandbox/a/b");
  std::ofstream("sandbox/file1.txt");
  fs::create_symlink("a", "sandbox/syma");
  for(auto& p: fs::recursive_directory_iterator("sandbox"))
std::cout << p << '\n';
  fs::remove_all("sandbox");
 }

Possible output:

 "sandbox/a"
 "sandbox/a/b"
 "sandbox/file1.txt"
 "sandbox/syma"