std::filesystem::begin(directory_iterator),std::filesystem::end(directory_iterator) (3) Linux Manual Page

std::filesystem::begin(directory_iterator),std::filesystem::end(directory_iterator) – std::filesystem::begin(directory_iterator),std::filesystem::end(directory_iterator)

Synopsis

directory_iterator begin( directory_iterator iter ) noexcept; (1) (since C++17)
directory_iterator end( const directory_iterator& ) noexcept; (2) (since C++17)
1) Returns iter unchanged
2) Returns a default-constructed directory_iterator, which serves as the end iterator. The argument is ignored.
These non-member functions enable the use of directory_iterators with range-based for loops.

Parameters

iter – a directory_iterator

Return value

1) iter unchanged
2) End iterator (default-constructed 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");
    std::ofstream("sandbox/file2.txt");
    for (auto &p : fs::directory_iterator("sandbox"))
        std::cout << p << '\n';
    fs::remove_all("sandbox");
}

Possible output:

  "sandbox/a"
  "sandbox/file1.txt"
  "sandbox/file2.txt"

See also

                                                     range-based for loop support
begin(std::filesystem::recursive_directory_iterator) (function)
end(std::filesystem::recursive_directory_iterator)