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

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

#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
(function)

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