std::experimental::filesystem::begin(directory_iterator), (3) - Linux Manuals

std::experimental::filesystem::begin(directory_iterator),: std::experimental::filesystem::begin(directory_iterator),

NAME

std::experimental::filesystem::begin(directory_iterator), - std::experimental::filesystem::begin(directory_iterator),

Synopsis

directory_iterator begin( directory_iterator iter ); (1) (filesystem TS)
directory_iterator end( const directory_iterator& ); (2) (filesystem TS)

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)

Exceptions

noexcept specification:
noexcept

Example

// Run this code

 #include <fstream>
 #include <iostream>
 #include <experimental/filesystem>
 namespace fs = std::experimental::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"