[fs.filesystem.error.members] (original) (raw)

31 Input/output library [input.output]

31.12 File systems [filesystems]

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

31.12.7.2 Members [fs.filesystem.error.members]

Constructors are provided that store zero, one, or two paths associated with an error.

filesystem_error(const string& what_arg, error_code ec);

Postconditions:

• code() == ec is true,
• path1().empty() is true,
• path2().empty() is true, and
• string_view(what()).find(what_arg.c_str()) != string_view​::​npos is true.

filesystem_error(const string& what_arg, const path& p1, error_code ec);

Postconditions:

• code() == ec is true,
• path1() returns a reference to the stored copy of p1,
• path2().empty() is true, and
• string_view(what()).find(what_arg.c_str()) != string_view​::​npos is true.

filesystem_error(const string& what_arg, const path& p1, const path& p2, error_code ec);

Postconditions:

• code() == ec,
• path1() returns a reference to the stored copy of p1,
• path2() returns a reference to the stored copy of p2, and
• string_view(what()).find(what_arg.c_str()) != string_view​::​npos.

const path& path1() const noexcept;

Returns: A reference to the copy of p1 stored by the constructor, or, if none, an empty path.

const path& path2() const noexcept;

Returns: A reference to the copy of p2 stored by the constructor, or, if none, an empty path.

const char* what() const noexcept override;

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.