operator==,!=,<,<=,>,>=(std::filesystem::path)

 

C++

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Freestanding and hosted implementations

Named requirements

Language support library

Concepts library (C++20)

Diagnostics library

Utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Input/output library

Localizations library

Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

Filesystem library (C++17)

Technical Specifications

 

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

 

std::filesystem::path

Constants
path::native_formatpath::generic_formatpath::auto_format
Member functions
path::path path::~path path::operator= path::assign path::appendpath::operator /= path::concatpath::operator += path::clear path::make_preferred path::remove_filename path::replace_filename path::replace_extension path::swap path::compare path::beginpath::end	path::c_strpath::nativepath::operator string_type path::stringpath::u8stringpath::u16stringpath::u32stringpath::wstring path::generic_stringpath::generic_u8stringpath::generic_u16stringpath::generic_u32stringpath::generic_wstring path::lexically_normalpath::lexically_relativepath::lexically_proximate
Path decomposition
path::root_name path::root_directory path::root_path path::relative_path path::parent_path path::filename path::stem path::extension path::empty	path::has_root_pathpath::has_root_namepath::has_root_directorypath::has_relative_pathpath::has_parent_pathpath::has_filenamepath::has_stempath::has_extension path::is_absolutepath::is_relative
Non-member functions
swap(path)
hash_value
operator==operator!=operator<operator<=operator>operator>=
operator/
operator<<operator>>
u8path

 

bool operator==( const path& lhs, const path& rhs ) noexcept;	(1)	(since C++17)
bool operator!=( const path& lhs, const path& rhs ) noexcept;	(2)	(since C++17)
bool operator<( const path& lhs, const path& rhs ) noexcept;	(3)	(since C++17)
bool operator<=( const path& lhs, const path& rhs ) noexcept;	(4)	(since C++17)
bool operator>( const path& lhs, const path& rhs ) noexcept;	(5)	(since C++17)
bool operator>=( const path& lhs, const path& rhs ) noexcept;	(6)	(since C++17)

Compares two paths lexicographically.

1) Checks whether lhs and rhs are equal. Equivalent to !(lhs < rhs) && !(rhs < lhs).

2) Checks whether lhs and rhs are not equal. Equivalent to !(lhs == rhs).

3) Checks whether lhs is less than rhs. Equivalent to lhs.compare(rhs) < 0.

4) Checks whether lhs is less than or equal to rhs. Equivalent to !(rhs < lhs).

5) Checks whether lhs is greater than rhs. Equivalent to rhs < lhs.

6) Checks whether lhs is greater than or equal to rhs. Equivalent to !(lhs < rhs).

These functions are not visible to ordinary unqualified or qualified lookup , and can only be found by argument-dependent lookup when std::filesystem::path is an associated class of the arguments. This prevents undesirable conversions in the presence of a using namespace std::filesystem; using-directive.

Parameters

lhs, rhs

-

the paths to compare

Return value

true if the corresponding comparison yields, false otherwise.

Notes

Path equality and equivalence have different semantics.

In the case of equality, as determined by operator==, only lexical representations are compared. Therefore, path("a") == path("b") is never true.

In the case of equivalence, as determined by equivalent(), it is checked whether two paths resolve to the same file system object. Thus equivalent("a", "b") will return true if the paths resolve to the same file.

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR	Applied to	Behavior as published	Correct behavior
LWG 3065	C++17	allowed comparison of everything convertible to path in the presence of a using-directive	made hidden friend

See also

compare

compares the lexical representations of two paths lexicographically (public member function)