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std::experi...system::copy(3) C++ Standard Libarystd::experi...system::copy(3) NAME std::experimental::filesystem::copy - std::experimental::filesys- tem::copy Synopsis Defined in header <experimental/filesystem> void copy( const path& from, const path& to ); (1) (filesystem TS) void copy( const path& from, const path& to, error_code& ec ); void copy( const path& from, const path& to, copy_options options ); (2) (filesystem TS) void copy( const path& from, const path& to, copy_options options, error_code& ec ); Copies files and directories, with a variety of options: 1) The default, equivalent to (2) with copy_options::none used as options. 2) Copies the file or directory from to file or directory to, using the copy options indicated by options. The behavior is undefined if there is more than one option in any of the copy_options option group present in options (even in the copy_file group, which is not relevant to copy). The behavior is as follows: * First, before doing anything else, obtains type and permissions of from by no more than single call to status (or, if copy_options::skip_sym- links or copy_options::create_symlinks are present in options, by a call to symlink_status). * If necessary, obtains the status of to the same way, by no more than a single status or symlink_status call. * If from does not exist, reports an error. * If from and to are the same file as determined by equivalent(), reports an error. * If either from or to is not a regular file, a directory, or a symlink, as determined by is_other, reports an error. * If from is a directory, but to is a regular file, reports an er- ror. * If from is a symbolic link, then * If copy_options::skip_symlink is present in options, does noth- ing. * Otherwise, if to does not exist and copy_options::copy_symlinks is present in options, then behaves as if copy_symlink(from, to). * Otherwise, reports an error. * Otherwise, if from is a regular file, then * If copy_options::directories_only is present in options, does nothing. * Otherwise, if copy_options::create_symlinks is present in op- tions, creates a symlink to to. Note: from must be an absolute path unless to is in the current directory. * Otherwise, if copy_options::create_hard_links is present in op- tions, creates a hard link to to. * Otherwise, if to is a directory, then behaves as if copy_file(from, to/from.filename(), options) (creates a copy of from as a file in the directory to). * Otherwise, behaves as if copy_file(from, to, options) (copies the file). * Otherwise, if from is a directory and either options has copy_options::recursive or is copy_options::none. * If to does not exist, first executes create_directory(to, from) (creates the new directory with a copy of the old directory's attributes). * Then, whether to already existed or was just created, iterates over the files contained in from as if by for (const directory_entry& x : directory_iterator(from)) and for each directory entry, recur- sively calls copy(x.path(), to/x.path().filename(), options | unspecified), where unspecified is a special bit that has no other effect when set in options (the sole purpose of setting this bit is to prevent recursive copying subdirecto- ries if options is copy_options::none). * Otherwise does nothing. Parameters from - path to the source file, directory, or symlink to - path to the target file, directory, or symlink ec - out-parameter for error reporting in the non-throwing over- load Return value (none) Exceptions The overload that does not take an error_code& parameter throws filesystem_error on underlying OS API errors, constructed with from as the first argu- ment, to 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 an er- ror_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 default behavior when copying directories is the non-recursive copy: the files are copied, but not the subdirectories: // Given // /dir1 contains /dir1/file1, /dir1/file2, /dir1/dir2 // and /dir1/dir2 contains /dir1/dir2/file3 // After std::experimental::filesystem::copy("/dir1", "/dir3"); // /dir3 is created (with the attributes of /dir1) // /dir1/file1 is copied to /dir3/file1 // /dir1/file2 is copied to /dir3/file2 While with copy_options::recursive, the subdirectories are also copied, with their content, recursively. // ...but after std::experimental::filesystem::copy("/dir1", "/dir3", copy_op- tions::recursive); // /dir3 is created (with the attributes of /dir1) // /dir1/file1 is copied to /dir3/file1 // /dir1/file2 is copied to /dir3/file2 // /dir3/dir2 is created (with the attributes of /dir1/dir2) // /dir1/dir2/file3 is copied to /dir3/dir2/file3 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_options specifies semantics of copy operations (enum) copy_symlink copies a symbolic link (function) copy_file copies file contents (function) Categories: * Noindexed pages * unconditionally noexcept Hidden categories: * Pages with unreviewed unconditional noexcept template * Pages with unreviewed noexcept template http://cppreference.com 2024.06.10 std::experi...system::copy(3)
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