libcxx/include/__filesystem/filesystem_error.h

   1 // -*- C++ -*-
   2 //===----------------------------------------------------------------------===//
   3 //
   4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   5 // See https://llvm.org/LICENSE.txt for license information.
   6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #ifndef _LIBCPP___FILESYSTEM_FILESYSTEM_ERROR_H
  11 #define _LIBCPP___FILESYSTEM_FILESYSTEM_ERROR_H
  12
  13 #include <__config>
  14 #include <__filesystem/path.h>
  15 #include <__memory/shared_ptr.h>
  16 #include <__system_error/error_code.h>
  17 #include <__system_error/system_error.h>
  18 #include <__utility/forward.h>
  19 #include <__verbose_abort>
  20 #include <string>
  21
  22 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  23 #  pragma GCC system_header
  24 #endif
  25
  26 #if _LIBCPP_STD_VER >= 17
  27
  28 _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM
  29
  30 class _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY _LIBCPP_EXPORTED_FROM_ABI filesystem_error : public system_error {
  31 public:
  32   _LIBCPP_HIDE_FROM_ABI filesystem_error(const string& __what, error_code __ec)
  33       : system_error(__ec, __what), __storage_(make_shared<_Storage>(path(), path())) {
  34     __create_what(0);
  35   }
  36
  37   _LIBCPP_HIDE_FROM_ABI filesystem_error(const string& __what, const path& __p1, error_code __ec)
  38       : system_error(__ec, __what), __storage_(make_shared<_Storage>(__p1, path())) {
  39     __create_what(1);
  40   }
  41
  42   _LIBCPP_HIDE_FROM_ABI filesystem_error(const string& __what, const path& __p1, const path& __p2, error_code __ec)
  43       : system_error(__ec, __what), __storage_(make_shared<_Storage>(__p1, __p2)) {
  44     __create_what(2);
  45   }
  46
  47   _LIBCPP_HIDE_FROM_ABI const path& path1() const noexcept { return __storage_->__p1_; }
  48
  49   _LIBCPP_HIDE_FROM_ABI const path& path2() const noexcept { return __storage_->__p2_; }
  50
  51   _LIBCPP_HIDE_FROM_ABI filesystem_error(const filesystem_error&) = default;
  52   ~filesystem_error() override; // key function
  53
  54   _LIBCPP_HIDE_FROM_ABI_VIRTUAL
  55   const char* what() const noexcept override { return __storage_->__what_.c_str(); }
  56
  57   void __create_what(int __num_paths);
  58
  59 private:
  60   struct _LIBCPP_HIDDEN _Storage {
  61     _LIBCPP_HIDE_FROM_ABI _Storage(const path& __p1, const path& __p2) : __p1_(__p1), __p2_(__p2) {}
  62
  63     path __p1_;
  64     path __p2_;
  65     string __what_;
  66   };
  67   shared_ptr<_Storage> __storage_;
  68 };
  69
  70 #  if _LIBCPP_HAS_EXCEPTIONS
  71 template <class... _Args>
  72 [[__noreturn__]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY void
  73 __throw_filesystem_error(_Args&&... __args) {
  74   throw filesystem_error(std::forward<_Args>(__args)...);
  75 }
  76 #  else
  77 template <class... _Args>
  78 [[__noreturn__]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY void
  79 __throw_filesystem_error(_Args&&...) {
  80   _LIBCPP_VERBOSE_ABORT("filesystem_error was thrown in -fno-exceptions mode");
  81 }
  82 #  endif
  83
  84 _LIBCPP_END_NAMESPACE_FILESYSTEM
  85
  86 #endif // _LIBCPP_STD_VER >= 17
  87
  88 #endif // _LIBCPP___FILESYSTEM_FILESYSTEM_ERROR_H