std::experimental::filesystem::create_directory,std::experimental::filesystem::create_directories

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Experimental

Technical Specification
Filesystem library(filesystem TS)
Library fundamentals(library fundamentals TS)
Library fundamentals 2(library fundamentals TS v2)
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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

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

1) Creates the directoryp as if by POSIXmkdir() with a second argument ofstatic_cast<int>(fs::perms::all) (the parent directory must already exist). Ifp 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 fromexisting_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 ofp that does not already exist.

The non-throwing overloads returnfalse if any error occurs.

[edit]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

[edit]Return value

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

[edit]Exceptions

1,3) The overload that does not take anerror_code& parameter throwsfilesystem_error on underlying OS API errors, constructed withp 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 anerror_code& parameter sets it to the OS API error code if an OS API call fails, and executesec.clear() if no errors occur. This overload has

noexcept specification:

noexcept

2) The overload that does not take anerror_code& parameter throwsfilesystem_error on underlying OS API errors, constructed withp 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 anerror_code& parameter sets it to the OS API error code if an OS API call fails, and executesec.clear() if no errors occur. This overload has

noexcept specification:

noexcept

[edit]Notes

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

[edit]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 adrwxr-x--- 2 user group 4096 Apr 15 09:33 bdrwxr-x--- 2 user group 4096 Apr 15 09:33 c

[edit]See also

create_symlinkcreate_directory_symlink	creates a symbolic link (function)[edit]
copy	copies files or directories (function)[edit]
perms	identifies file system permissions (enum)[edit]