31 Input/output library [input.output]

31.12 File systems [filesystems]

31.12.7 Class filesystem_error [fs.class.filesystem.error]

31.12.7.1 General [fs.class.filesystem.error.general]

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namespace std::filesystem { class filesystem_error : public system_error { public: filesystem_error(const string& what_arg, error_code ec); filesystem_error(const string& what_arg, const path& p1, error_code ec); filesystem_error(const string& what_arg, const path& p1, const path& p2, error_code ec); const path& path1() const noexcept; const path& path2() const noexcept; const char* what() const noexcept override; }; }
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The class filesystem_error defines the type of objects thrown as exceptions to report file system errors from functions described in subclause [filesystems].

31.12.7.2 Members [fs.filesystem.error.members]

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Constructors are provided that store zero, one, or two paths associated with an error.
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filesystem_error(const string& what_arg, error_code ec);
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Postconditions:
  • (2.1)
    code() == ec is true,
  • (2.2)
    path1().empty() is true,
  • (2.3)
    path2().empty() is true, and
  • (2.4)
    string_view(what()).find(what_arg.c_str()) != string_view​::​npos is true.
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filesystem_error(const string& what_arg, const path& p1, error_code ec);
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Postconditions:
  • (3.1)
    code() == ec is true,
  • (3.2)
    path1() returns a reference to the stored copy of p1,
  • (3.3)
    path2().empty() is true, and
  • (3.4)
    string_view(what()).find(what_arg.c_str()) != string_view​::​npos is true.
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filesystem_error(const string& what_arg, const path& p1, const path& p2, error_code ec);
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Postconditions:
  • (4.1)
    code() == ec,
  • (4.2)
    path1() returns a reference to the stored copy of p1,
  • (4.3)
    path2() returns a reference to the stored copy of p2, and
  • (4.4)
    string_view(what()).find(what_arg.c_str()) != string_view​::​npos.
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const path& path1() const noexcept;
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Returns: A reference to the copy of p1 stored by the constructor, or, if none, an empty path.
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const path& path2() const noexcept;
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Returns: A reference to the copy of p2 stored by the constructor, or, if none, an empty path.
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const char* what() const noexcept override;
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Returns: An ntbs that incorporates the what_arg argument supplied to the constructor.
The exact format is unspecified.
Implementations should include the system_error​::​what() string and the pathnames of path1 and path2 in the native format in the returned string.