bits/fs_fwd.h

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// Filesystem declarations -*- C++ -*-
 
// Copyright (C) 2014-2025 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
 
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
 
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
 
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.
 
/** @file include/bits/fs_fwd.h
 *  This is an internal header file, included by other library headers.
 *  Do not attempt to use it directly. @headername{filesystem}
 */
 
#ifndef _GLIBCXX_FS_FWD_H
#define _GLIBCXX_FS_FWD_H 1
 
#if __cplusplus >= 201703L
 
#include <system_error>
#include <cstdint>
#include <bits/chrono.h>
 
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
 
/// ISO C++ 2017 namespace for File System library
namespace filesystem
{
#if _GLIBCXX_USE_CXX11_ABI
/// @cond undocumented
inline namespace __cxx11 __attribute__((__abi_tag__ ("cxx11"))) { }
/// @endcond
#endif
 
/** @addtogroup filesystem
 *  @{
 */
 
  class file_status;
_GLIBCXX_BEGIN_NAMESPACE_CXX11
  class path;
  class filesystem_error;
  class directory_entry;
  class directory_iterator;
  class recursive_directory_iterator;
_GLIBCXX_END_NAMESPACE_CXX11
 
  /// Information about free space on a disk
  struct space_info
  {
    uintmax_t capacity;
    uintmax_t free;
    uintmax_t available;
 
#if __cpp_impl_three_way_comparison >= 201907L
    friend bool operator==(const space_info&, const space_info&) = default;
#endif
  };
 
  /// Enumerated type representing the type of a file
  enum class file_type : signed char {
      none = 0, not_found = -1, regular = 1, directory = 2, symlink = 3,
      block = 4, character = 5, fifo = 6, socket = 7, unknown = 8
  };
 
  /// Bitmask type controlling effects of `filesystem::copy`
  enum class copy_options : unsigned short {
      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
  };
 
  /// @{
  /// @relates copy_options
  [[nodiscard]]
  constexpr copy_options
  operator&(copy_options __x, copy_options __y) noexcept
  {
    using __utype = typename std::underlying_type<copy_options>::type;
    return static_cast<copy_options>(
        static_cast<__utype>(__x) & static_cast<__utype>(__y));
  }
 
  [[nodiscard]]
  constexpr copy_options
  operator|(copy_options __x, copy_options __y) noexcept
  {
    using __utype = typename std::underlying_type<copy_options>::type;
    return static_cast<copy_options>(
        static_cast<__utype>(__x) | static_cast<__utype>(__y));
  }
 
  [[nodiscard]]
  constexpr copy_options
  operator^(copy_options __x, copy_options __y) noexcept
  {
    using __utype = typename std::underlying_type<copy_options>::type;
    return static_cast<copy_options>(
        static_cast<__utype>(__x) ^ static_cast<__utype>(__y));
  }
 
  [[nodiscard]]
  constexpr copy_options
  operator~(copy_options __x) noexcept
  {
    using __utype = typename std::underlying_type<copy_options>::type;
    return static_cast<copy_options>(~static_cast<__utype>(__x));
  }
 
  inline copy_options&
  operator&=(copy_options& __x, copy_options __y) noexcept
  { return __x = __x & __y; }
 
  inline copy_options&
  operator|=(copy_options& __x, copy_options __y) noexcept
  { return __x = __x | __y; }
 
  inline copy_options&
  operator^=(copy_options& __x, copy_options __y) noexcept
  { return __x = __x ^ __y; }
  /// @}
 
 
  /// Bitmask type representing file access permissions
  enum class perms : unsigned {
      none              =  0,
      owner_read        =  0400,
      owner_write       =  0200,
      owner_exec        =  0100,
      owner_all         =  0700,
      group_read        =   040,
      group_write       =   020,
      group_exec        =   010,
      group_all         =   070,
      others_read       =    04,
      others_write      =    02,
      others_exec       =    01,
      others_all        =    07,
      all               =  0777,
      set_uid           = 04000,
      set_gid           = 02000,
      sticky_bit        = 01000,
      mask              = 07777,
      unknown           =  0xFFFF,
  };
 
  /// @{
  /// @relates perms
  [[nodiscard]]
  constexpr perms
  operator&(perms __x, perms __y) noexcept
  {
    using __utype = typename std::underlying_type<perms>::type;
    return static_cast<perms>(
        static_cast<__utype>(__x) & static_cast<__utype>(__y));
  }
 
  [[nodiscard]]
  constexpr perms
  operator|(perms __x, perms __y) noexcept
  {
    using __utype = typename std::underlying_type<perms>::type;
    return static_cast<perms>(
        static_cast<__utype>(__x) | static_cast<__utype>(__y));
  }
 
  [[nodiscard]]
  constexpr perms
  operator^(perms __x, perms __y) noexcept
  {
    using __utype = typename std::underlying_type<perms>::type;
    return static_cast<perms>(
        static_cast<__utype>(__x) ^ static_cast<__utype>(__y));
  }
 
  [[nodiscard]]
  constexpr perms
  operator~(perms __x) noexcept
  {
    using __utype = typename std::underlying_type<perms>::type;
    return static_cast<perms>(~static_cast<__utype>(__x));
  }
 
  inline perms&
  operator&=(perms& __x, perms __y) noexcept
  { return __x = __x & __y; }
 
  inline perms&
  operator|=(perms& __x, perms __y) noexcept
  { return __x = __x | __y; }
 
  inline perms&
  operator^=(perms& __x, perms __y) noexcept
  { return __x = __x ^ __y; }
  /// @}
 
  /// Bitmask type controlling changes to permissions
  enum class perm_options : unsigned {
      replace   = 0x1,
      add       = 0x2,
      remove    = 0x4,
      nofollow  = 0x8
  };
 
  /// @{
  /// @relates perm_options
  [[nodiscard]]
  constexpr perm_options
  operator&(perm_options __x, perm_options __y) noexcept
  {
    using __utype = typename std::underlying_type<perm_options>::type;
    return static_cast<perm_options>(
        static_cast<__utype>(__x) & static_cast<__utype>(__y));
  }
 
  [[nodiscard]]
  constexpr perm_options
  operator|(perm_options __x, perm_options __y) noexcept
  {
    using __utype = typename std::underlying_type<perm_options>::type;
    return static_cast<perm_options>(
        static_cast<__utype>(__x) | static_cast<__utype>(__y));
  }
 
  [[nodiscard]]
  constexpr perm_options
  operator^(perm_options __x, perm_options __y) noexcept
  {
    using __utype = typename std::underlying_type<perm_options>::type;
    return static_cast<perm_options>(
        static_cast<__utype>(__x) ^ static_cast<__utype>(__y));
  }
 
  [[nodiscard]]
  constexpr perm_options
  operator~(perm_options __x) noexcept
  {
    using __utype = typename std::underlying_type<perm_options>::type;
    return static_cast<perm_options>(~static_cast<__utype>(__x));
  }
 
  inline perm_options&
  operator&=(perm_options& __x, perm_options __y) noexcept
  { return __x = __x & __y; }
 
  inline perm_options&
  operator|=(perm_options& __x, perm_options __y) noexcept
  { return __x = __x | __y; }
 
  inline perm_options&
  operator^=(perm_options& __x, perm_options __y) noexcept
  { return __x = __x ^ __y; }
  /// @}
 
  /// Bitmask type controlling directory iteration
  enum class directory_options : unsigned char {
      none = 0, follow_directory_symlink = 1, skip_permission_denied = 2
  };
 
  /// @{
  /// @relates directory_options
  [[nodiscard]]
  constexpr directory_options
  operator&(directory_options __x, directory_options __y) noexcept
  {
    using __utype = typename std::underlying_type<directory_options>::type;
    return static_cast<directory_options>(
        static_cast<__utype>(__x) & static_cast<__utype>(__y));
  }
 
  [[nodiscard]]
  constexpr directory_options
  operator|(directory_options __x, directory_options __y) noexcept
  {
    using __utype = typename std::underlying_type<directory_options>::type;
    return static_cast<directory_options>(
        static_cast<__utype>(__x) | static_cast<__utype>(__y));
  }
 
  [[nodiscard]]
  constexpr directory_options
  operator^(directory_options __x, directory_options __y) noexcept
  {
    using __utype = typename std::underlying_type<directory_options>::type;
    return static_cast<directory_options>(
        static_cast<__utype>(__x) ^ static_cast<__utype>(__y));
  }
 
  [[nodiscard]]
  constexpr directory_options
  operator~(directory_options __x) noexcept
  {
    using __utype = typename std::underlying_type<directory_options>::type;
    return static_cast<directory_options>(~static_cast<__utype>(__x));
  }
 
  inline directory_options&
  operator&=(directory_options& __x, directory_options __y) noexcept
  { return __x = __x & __y; }
 
  inline directory_options&
  operator|=(directory_options& __x, directory_options __y) noexcept
  { return __x = __x | __y; }
 
  inline directory_options&
  operator^=(directory_options& __x, directory_options __y) noexcept
  { return __x = __x ^ __y; }
  /// @}
 
  /// The type used for file timestamps
  using file_time_type = __file_clock::time_point;
 
  // operational functions
 
  void copy(const path& __from, const path& __to, copy_options __options);
  void copy(const path& __from, const path& __to, copy_options __options,
            error_code&);
 
  bool copy_file(const path& __from, const path& __to, copy_options __option);
  bool copy_file(const path& __from, const path& __to, copy_options __option,
                 error_code&);
 
  path current_path();
 
  bool exists(file_status) noexcept;
 
  bool is_other(file_status) noexcept;
 
  uintmax_t file_size(const path&);
  uintmax_t file_size(const path&, error_code&) noexcept;
  uintmax_t hard_link_count(const path&);
  uintmax_t hard_link_count(const path&, error_code&) noexcept;
  file_time_type last_write_time(const path&);
  file_time_type last_write_time(const path&, error_code&) noexcept;
 
  void permissions(const path&, perms, perm_options, error_code&) noexcept;
 
  path proximate(const path& __p, const path& __base, error_code& __ec);
  path proximate(const path& __p, const path& __base, error_code& __ec);
 
  path relative(const path& __p, const path& __base, error_code& __ec);
 
  file_status status(const path&);
  file_status status(const path&, error_code&) noexcept;
 
  bool status_known(file_status) noexcept;
 
  file_status symlink_status(const path&);
  file_status symlink_status(const path&, error_code&) noexcept;
 
  bool is_regular_file(file_status) noexcept;
  bool is_symlink(file_status) noexcept;
 
  bool remove(const path&, error_code&) noexcept;
  uintmax_t remove_all(const path&);
  uintmax_t remove_all(const path&, error_code&);
 
/// @}
} // namespace filesystem
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std
#endif // C++17
#endif // _GLIBCXX_FS_FWD_H