NAME¶

std::experimental::filesystem::create_directory, - std::experimental::filesystem::create_directory,

Synopsis¶

Defined in header <experimental/filesystem>
bool create_directory( const path& p ); (1) (filesystem TS)
bool create_directory( const path& p, error_code& ec );
bool create_directory( const path& p, const path& existing_p );
bool create_directory( const path& p, const path& existing_p, (2) (filesystem TS)
error_code& ec );
bool create_directories( const path& p ); (3) (filesystem TS)
bool create_directories( const path& p, error_code& ec );

1) Creates the directory p as if by POSIX mkdir() with a second argument of
static_cast<int>(fs::perms::all) (the parent directory must already exist). If p
already exists and is already a directory, the function does nothing (this condition
is not treated as an error).
2) Same as (1), except that the attributes of the new directory are copied from
existing_p (which must be a directory that exists). It is OS-dependent which
attributes are copied: on POSIX systems, the attributes are copied as if by

stat(existing_p.c_str(), &attributes_stat)
mkdir(p.c_str(), attributes_stat.st_mode)

On Windows OS, the attributes are copied as if by

CreateDirectoryExW(existing_p.c_str(), p.c_str(), 0)

3) Executes (1) for every element of p that does not already exist.

The non-throwing overloads return false if any error occurs.

Parameters¶

p - the path to the new directory to create
existing_p - the path to a directory to copy the attributes from
ec - out-parameter for error reporting in the non-throwing overload

Return value¶

1,2) true if directory creation is successful, false otherwise.

Exceptions¶

1,3) The overload that does not take an error_code& parameter throws
filesystem_error on underlying OS API errors, constructed with p as the first
argument and the OS error code as the error code argument. std::bad_alloc may be
thrown if memory allocation fails. The overload taking an 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. This overload has
noexcept specification:
noexcept

2) The overload that does not take an error_code& parameter throws filesystem_error
on underlying OS API errors, constructed with p as the first argument, existing_p as
the second argument, and the OS error code as the error code argument.
std::bad_alloc may be thrown if memory allocation fails. The overload taking an
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. This overload has
noexcept specification:
noexcept

Notes¶

The attribute-preserving overload (2) is implicitly invoked by copy() when
recursively copying directories. Its equivalent in boost.filesystem is
copy_directory (with argument order reversed).

Example¶

// Run this code

#include <cstdlib>
#include <experimental/filesystem>
#include <fstream>
#include <iostream>
namespace fs = std::experimental::filesystem;

int main()
{
fs::create_directories("sandbox/1/2/a");
fs::create_directory("sandbox/1/2/b");
fs::permissions("sandbox/1/2/b", fs::perms::remove_perms | fs::perms::others_all);
fs::create_directory("sandbox/1/2/c", "sandbox/1/2/b");
std::system("ls -l sandbox/1/2");
fs::remove_all("sandbox");
}

Possible output:¶

drwxr-xr-x 2 user group 4096 Apr 15 09:33 a
drwxr-x--- 2 user group 4096 Apr 15 09:33 b
drwxr-x--- 2 user group 4096 Apr 15 09:33 c

See also¶

create_symlink creates a symbolic link
create_directory_symlink (function)
copy copies files or directories
(function)
perms identifies file system permissions
(enum)

Categories:¶

* Noindexed pages
* unconditionally noexcept

Hidden categories:¶

* Pages with unreviewed unconditional noexcept template
* Pages with unreviewed noexcept template