std::filesystem::directory_iterator::directory_iterator

 

C++

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Named requirements

Feature test macros (C++20)

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Concepts library (C++20)

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Ranges library (C++20)

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Filesystem library (C++17)

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Technical specifications

Symbols index

External libraries

 

Filesystem library

Classes
filesystem::path filesystem::filesystem_error filesystem::directory_entry filesystem::directory_iterator filesystem::recursive_directory_iterator      filesystem::file_status	filesystem::space_info filesystem::file_type filesystem::perms filesystem::perm_options filesystem::copy_options filesystem::directory_options filesystem::file_time_type
Functions
filesystem::absolute filesystem::canonicalfilesystem::weakly_canonical filesystem::relativefilesystem::proximate filesystem::copy filesystem::copy_file filesystem::copy_symlink filesystem::create_directory filesystem::create_directories filesystem::create_hard_link filesystem::create_symlink filesystem::create_directory_symlink filesystem::current_path	filesystem::exists filesystem::equivalent filesystem::file_size filesystem::hard_link_count filesystem::last_write_time filesystem::permissions filesystem::read_symlink filesystem::remove filesystem::remove_all filesystem::rename filesystem::resize_file filesystem::space filesystem::status filesystem::symlink_status filesystem::temp_directory_path
File types
filesystem::is_block_file filesystem::is_character_file filesystem::is_directory filesystem::is_empty filesystem::status_known	filesystem::is_fifo filesystem::is_other filesystem::is_regular_file filesystem::is_socket filesystem::is_symlink

 

std::filesystem::directory_iterator

Member functions

directory_iterator::directory_iterator

directory_iterator::operator*directory_iterator::operator->

directory_iterator::operator=

incrementoperator++

Non-member functions

begin(std::filesystem::directory_iterator)end(std::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 a 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 a 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.

Exceptions

2-5) The overload that does not take a std::error_code& parameter throws filesystem::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