std::filesystem::filesystem_error::filesystem_error

 

C++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

Metaprogramming library (C++11)

Diagnostics library

General utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

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Filesystem library (C++17)

Regular expressions library (C++11)

Concurrency support library (C++11)

Execution support library (C++26)

Technical specifications

Symbols index

External libraries

 

Filesystem library

Classes
filesystem::path filesystem::filesystem_error filesystem::directory_entry filesystem::directory_iterator filesystem::recursive_directory_iterator      filesystem::file_status	filesystem::space_info filesystem::file_type filesystem::perms filesystem::perm_options filesystem::copy_options filesystem::directory_options filesystem::file_time_type
Functions
filesystem::absolute filesystem::canonicalfilesystem::weakly_canonical filesystem::relativefilesystem::proximate filesystem::copy filesystem::copy_file filesystem::copy_symlink filesystem::create_directory filesystem::create_directories filesystem::create_hard_link filesystem::create_symlink filesystem::create_directory_symlink filesystem::current_path	filesystem::exists filesystem::equivalent filesystem::file_size filesystem::hard_link_count filesystem::last_write_time filesystem::permissions filesystem::read_symlink filesystem::remove filesystem::remove_all filesystem::rename filesystem::resize_file filesystem::space filesystem::status filesystem::symlink_status filesystem::temp_directory_path
File types
filesystem::is_block_file filesystem::is_character_file filesystem::is_directory filesystem::is_empty filesystem::status_known	filesystem::is_fifo filesystem::is_other filesystem::is_regular_file filesystem::is_socket filesystem::is_symlink

 

filesystem_error

Member functions

filesystem_error::filesystem_error

filesystem_error::operator=

filesystem_error::path1filesystem_error::path2

filesystem_error::what

Inherited from std::system_error

system_error::code

 

filesystem_error( const std::string& what_arg,                   std::error_code ec );	(1)	(since C++17)
filesystem_error( const std::string& what_arg,                   const std::filesystem::path& p1,                   std::error_code ec );	(2)	(since C++17)
filesystem_error( const std::string& what_arg,                   const std::filesystem::path& p1,                   const std::filesystem::path& p2,                   std::error_code ec );	(3)	(since C++17)
filesystem_error( const filesystem_error& other ) noexcept;	(4)	(since C++17)

Constructs a new filesystem_error object.

1-3) The error code is set to ec and optionally, the paths that were involved in the operation that resulted in the error, are set to p1 and p2. what() after construction returns a string that contains what_arg (assuming that it does not contain an embedded null character ). If either or both path arguments are not provided, a null path is used instead.

4) Copy constructor. Initialize the contents with those of other. If *this and other both have dynamic type std::filesystem_error::filesystem_error then std::strcmp(what(), other.what()) == 0.

Parameters

what_arg	-	explanatory string
ec	-	error code for the specific operating system dependent error
p1, p2	-	paths involved in the operation raising system error
other	-	another filesystem_error object to copy

Notes

Because copying std::filesystem::filesystem_error is not permitted to throw exceptions, the explanatory string is typically stored internally in a separately-allocated reference-counted storage. This is also why there is no constructor taking std::string&&: it would have to copy the content anyway.

Typical implementations also store path objects referenced by path1() and path2() in the reference-counted storage.