std::experimental::filesystem::copy_options

 

C++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

Metaprogramming library (C++11)

Diagnostics library

General utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Localizations library

Input/output library

Filesystem library (C++17)

Regular expressions library (C++11)

Concurrency support library (C++11)

Technical specifications

Symbols index

External libraries

 

Technical specifications

Filesystem library (filesystem TS)

Library fundamentals (library fundamentals TS)

Library fundamentals 2 (library fundamentals TS v2)

Library fundamentals 3 (library fundamentals TS v3)

Extensions for parallelism (parallelism TS)

Extensions for parallelism 2 (parallelism TS v2)

Extensions for concurrency (concurrency TS)

Extensions for concurrency 2 (concurrency TS v2)

Concepts (concepts TS)

Ranges (ranges TS)

Reflection (reflection TS)

Mathematical special functions (special functions TR)

 

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

 

Defined in header <experimental/filesystem>
enum class copy_options {     none = 0,     skip_existing = 1,     overwrite_existing = 2,     update_existing = 4,     recursive = 8,     copy_symlinks = 16,     skip_symlinks = 32,     directories_only = 64,     create_symlinks = 128,     create_hard_links = 256 };		(filesystem TS)

This type represents available options that control the behavior of the copy() and copy_file() function.

copy_options satisfies the requirements of BitmaskType (which means the bitwise operators operator&, operator|, operator^, operator~, operator&=, operator|=, and operator^= are defined for this type).

Member constants

At most one copy option in each of the following options groups may be present, otherwise the behavior of the copy functions is undefined.

Member constant	Value	Meaning
options controlling copy_file() when the file already exists
none	​0​	Report an error (default behavior).
skip_existing	1	Keep the existing file, without reporting an error.
overwrite_existing	2	Replace the existing file.
update_existing	4	Replace the existing file only if it is older than the file being copied.
options controlling the effects of copy() on subdirectories
none	​0​	Skip subdirectories (default behavior).
recursive	8	Recursively copy subdirectories and their content.
options controlling the effects of copy() on symbolic links
none	​0​	Follow symlinks (default behavior).
copy_symlinks	16	Copy symlinks as symlinks, not as the files they point to.
skip_symlinks	32	Ignore symlinks.
options controlling the kind of copying copy() does
none	​0​	Copy file content (default behavior).
directories_only	64	Copy the directory structure, but do not copy any non-directory files.
create_symlinks	128	Instead of creating copies of files, create symlinks pointing to the originals. Note: the source path must be an absolute path unless the destination path is in the current directory.
create_hard_links	256	Instead of creating copies of files, create hardlinks that resolve to the same files as the originals.

Example

Run this code

#include <experimental/filesystem>
#include <fstream>
#include <iostream>
namespace fs = std::experimental::filesystem;
 
int main()
{
    fs::create_directories("sandbox/dir/subdir");
    std::ofstream("sandbox/file1.txt").put('a');
    fs::copy("sandbox/file1.txt", "sandbox/file2.txt"); // copy file
    fs::copy("sandbox/dir", "sandbox/dir2"); // copy directory (non-recursive)
    // sandbox holds 2 files and 2 directories, one of which has a subdirectory
    // sandbox/file1.txt
    // sandbox/file2.txt
    // sandbox/dir2
    // sandbox/dir
    //    sandbox/dir/subdir
    fs::copy("sandbox", "sandbox/copy", fs::copy_options::recursive);
    // sandbox/copy holds copies of the above files and subdirectories
    fs::remove_all("sandbox");
}

See also

copy	copies files or directories (function)
copy_file	copies file contents (function)