< cpp‎ | experimental‎ | fs
Technical specifications
Filesystem library (filesystem TS)
Library fundamentals (library fundamentals TS)
Library fundamentals 2 (library fundamentals 2 TS)
Extensions for parallelism (parallelism TS)
Extensions for parallelism 2 (parallelism TS v2)
Extensions for concurrency (concurrency TS)
Concepts (concepts TS)
Ranges (ranges TS)
Special mathematical functions (special math TR)
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


#include <iostream>
#include <fstream>
#include <experimental/filesystem>
namespace fs = std::experimental::filesystem;
int main()
    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

See also

copies files or directories
copies file contents