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# std::experimental::filesystem::copy_options

From cppreference.com
< cpp‎ | experimental‎ | fs

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)

### [edit] 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

### [edit] Example

Run this code

    #include <iostream>
    #include <fstream>
    #include <experimental/filesystem>
    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");
    }

### [edit] See also

copy | copies files or directories (function) [edit]
copy_file | copies file contents (function) [edit]

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