std::experimental::filesystem::directory_iterator

 

C++

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Freestanding and hosted

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Standard library

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Named requirements

Feature test macros (C++20)

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Concepts library (C++20)

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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::copy_options filesystem::directory_options filesystem::file_time_type
Functions
filesystem::absolute filesystem::system_complete filesystem::canonical 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

 

directory_iterator

Member functions

directory_iterator::directory_iterator

directory_iterator::operator*directory_iterator::operator->

directory_iterator::operator=

directory_iterator::incrementdirectory_iterator::operator++

Non-member functions

begin(directory_iterator)end(directory_iterator)

 

Defined in header <experimental/filesystem>
class directory_iterator;		(filesystem TS)

directory_iterator is a LegacyInputIterator that iterates over the directory_entry elements of a directory (but does not visit the subdirectories). The iteration order is unspecified, except that each directory entry is visited only once. The special pathnames dot and dot-dot are skipped.

If the directory_iterator is advanced past the last directory entry, it becomes equal to the default-constructed iterator, also known as the end iterator. Two end iterators are always equal, dereferencing or incrementing the end iterator is undefined behavior.

If a file or a directory is deleted or added to the directory tree after the directory iterator has been created, it is unspecified whether the change would be observed through the iterator.

Member types

Member type	Definition
value_type	filesystem::directory_entry
difference_type	std::ptrdiff_t
pointer	const filesystem::directory_entry*
reference	const filesystem::directory_entry&
iterator_category	std::input_iterator_tag

Member functions

(constructor)	constructs a directory iterator (public member function)
(destructor)	default destructor (public member function)
operator=	assigns contents (public member function)
operator*operator->	accesses the pointed-to entry (public member function)
incrementoperator++	advances to the next entry (public member function)

Non-member functions

filesystem::begin(filesystem::directory_iterator)filesystem::end(filesystem::directory_iterator)

range-based for loop support (function)

Additionally, operator== and operator!= are provided, either as members or as non-members, as required by LegacyInputIterator.

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"};
    std::ofstream{"sandbox/file2.txt"};
    for (const fs::directory_entry& entry : fs::directory_iterator{"sandbox"})
        std::cout << entry << '\n';
    fs::remove_all("sandbox");
}

Possible output:

"sandbox/a"
"sandbox/file1.txt"
"sandbox/file2.txt"

See also

recursive_directory_iterator	an iterator to the contents of a directory and its subdirectories (class)
directory_options	options for iterating directory contents (enum)
directory_entry	a directory entry (class)