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

From cppreference.com
C++
Experimental
Filesystem library
Classes
Functions
File types
recursive_directory_iterator
recursive_directory_iterator begin ( recursive_directory_iterator iter ) ;
(1) (filesystem TS)
recursive_directory_iterator end ( const recursive_directory_iterator & ) ;
(2) (filesystem TS)
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_iterator s with range-based for loops.

Parameters

iter - a recursive_directory_iterator

Return value

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

Exceptions

noexcept specification:
noexcept

Example

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

See also

range-based for loop support
(function)
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