std::experimental::filesystem::create_directory, std::experimental::filesystem::create_directories
From cppreference.com
< cpp | experimental | fs
| Defined in header <experimental/filesystem>
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| 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 On Windows OS, the attributes are copied as if by
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)
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 a
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 a 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 a
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 a 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 <iostream> #include <fstream> #include <cstdlib> #include <experimental/filesystem> 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
| creates a symbolic link (function) | |
| copies files or directories (function) | |
| identifies file system permissions (enum) |