std::experimental::filesystem::create_directory, std::experimental::filesystem::create_directories
From cppreference.com
< cpp | experimental | fs
| 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 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
On Windows OS, the attributes are copied as if by
stat(existing_p.c_str(), &attributes_stat) mkdir(p.c_str(), attributes_stat.st_mode)
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.
Contents |
[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 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
[edit] 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).
[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 a drwxr-x--- 2 user group 4096 Apr 15 09:33 b drwxr-x--- 2 user group 4096 Apr 15 09:33 c
[edit] See also
| creates a symbolic link (function) | |
| copies files or directories (function) | |
| identifies file system permissions (enum) |
