# std::filesystem::directory_iterator::directory_iterator

From cppreference.com
< cpp‎ | filesystem‎ | directory iterator

directory_iterator() noexcept; | (1) | (since C++17)
explicit directory_iterator( const std::filesystem::path & p ); | (2) | (since C++17)
directory_iterator( const std::filesystem::path & p, std::filesystem::directory_options options); | (3) | (since C++17)
directory_iterator( const std::filesystem::path & p, std::error_code & ec ); | (4) | (since C++17)
directory_iterator( const std::filesystem::path & p, std::filesystem::directory_options options, std::error_code & ec ); | (5) | (since C++17)
directory_iterator( const directory_iterator& ) = default; | (6) | (since C++17)
directory_iterator( directory_iterator&& ) = default; | (7) | (since C++17)

Constructs a new directory iterator.

1) Constructs the end iterator.
2) Constructs a directory iterator that refers to the first directory entry of a directory identified by `p`. If `p` refers to an non-existing file or not a directory, throws std::filesystem::filesystem_error.
3) Same as (2), but if std::filesystem::directory_options::skip_permission_denied is set in `options` and construction encounters a permissions denied error, constructs the end iterator and does not report an error.
4) Constructs a directory iterator that refers to the first directory entry of a directory identified by `p`. If `p` refers to an non-existing file or not a directory, returns the end iterator and sets `ec`.
5) Same as (4), but if std::filesystem::directory_options::skip_permission_denied is set in `options` and construction encounters a permissions denied error, constructs the end iterator and does not report an error.

### Parameters

| This section is incomplete

### Exceptions

2-5) The overload that does not take a std::error_code & parameter throws `filesystem_error` on underlying OS API errors, constructed with `p` as the first path argument and the OS error code as the error code argument. The overload taking a std::error_code & parameter sets it to the OS API error code if an OS API call fails, and executes ec.clear() if no errors occur. Any overload not marked `noexcept` may throw std::bad_alloc if memory allocation fails.

### Notes

To iterate over the current directory, construct the iterator as directory_iterator(".") instead of directory_iterator("").

### Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR | Applied to | Behavior as published | Correct behavior
--- | --- | --- | ---
LWG 3013 | C++17 | `error_code` overload marked noexcept but can allocate memory | noexcept removed

Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/filesystem/directory_iterator/directory_iterator&oldid=105020"