Showing content from https://timsong-cpp.github.io/cppwp/n4659/fs.enum.copy.opts below:
[fs.enum.copy.opts]
The enum class type copy_options is a bitmask type ([bitmask.types]) that specifies bitmask constants used to control the semantics of copy operations. The constants are specified in option groups with the meanings listed in Table 124. Constant none is shown in each option group for purposes of exposition; implementations shall provide only a single definition.
Table
124
— Enum class
copy_options
Option group controlling copy_file function effects for existing target files Constant Meaning none (Default) Error; file already exists. skip_existing Do not overwrite existing file, do not report an error. overwrite_existing Overwrite the existing file. update_existing Overwrite the existing file if it is older than the replacement file. Option group controlling copy function effects for sub-directories Constant Meaning none (Default) Do not copy sub-directories. recursive Recursively copy sub-directories and their contents. Option group controlling copy function effects for symbolic links Constant Meaning none (Default) Follow symbolic links. copy_symlinks Copy symbolic links as symbolic links rather than copying the files that they point to. skip_symlinks Ignore symbolic links. Option group controlling copy function effects for choosing the form of copying Constant Meaning none (Default) Copy content. directories_only Copy directory structure only, do not copy non-directory files. create_symlinks Make symbolic links instead of copies of files. The source path shall be an absolute path unless the destination path is in the current directory. create_hard_links Make hard links instead of copies of files.
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