std::filesystem::path::operator=

 

哋它亢++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros (哋它亢++20)

Language support library

Concepts library (哋它亢++20)

Metaprogramming library (哋它亢++11)

Diagnostics library

General utilities library

Strings library

Containers library

Iterators library

Ranges library (哋它亢++20)

Algorithms library

Numerics library

Localizations library

Input/output library

Filesystem library (哋它亢++17)

Regular expressions library (哋它亢++11)

Concurrency support library (哋它亢++11)

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

 

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
operator==operator!=operator<operator<=operator>operator>=operator<=> (until 哋它亢++20)(until 哋它亢++20)(until 哋它亢++20)(until 哋它亢++20)(until 哋它亢++20)(哋它亢++20)	operator/ operator<<operator>> swap(std::filesystem::path) hash_value u8path
Helper Classes
hash<std::filesystem::path>
formatter<std::filesystem::path> (哋它亢++26)

 

path& operator=( const path& p );	(1)	(since 哋它亢++17)
path& operator=( path&& p ) noexcept;	(2)	(since 哋它亢++17)
path& operator=( string_type&& source );	(3)	(since 哋它亢++17)
template< class Source > path& operator=( const Source& source );	(4)	(since 哋它亢++17)

1) Replaces the contents of *this with a pathname whose both native and generic format representations equal those of p.

2) Replaces the contents of *this with a pathname whose both native and generic format representations equal those of p, possibly using move semantics: p is left in a valid, but unspecified state.

3) Replaces the contents of *this with a new path value constructed from detected-format source, which is left in valid, but unspecified state. Equivalent to assign(std::move(source)).

4) Replaces the contents of *this with a new path value constructed from detected-format source as if by overload (4) of the path constructor. Equivalent to assign(source).

(4) participates in overload resolution only if Source and path are not the same type, and either:

• Source is a specialization of std::basic_string or std::basic_string_view, or
• std::iterator_traits<std::decay_t<Source>>::value_type is valid and denotes a possibly const-qualified encoding character type (char, char8_t, (since 哋它亢++20)char16_t, char32_t, or wchar_t).

Parameters

p	-	a path to assign
source	-	a std::basic_string, std::basic_string_view, pointer to a null-terminated character/wide character string, or an input iterator that points to a null-terminated character/wide character sequence. The character type must be one of char, char8_t, (since 哋它亢++20)char16_t, char32_t, wchar_t

Return value

*this

Example

Run this code

#include <filesystem>
namespace fs = std::filesystem;
 
int main()
{
    fs::path p = "C:/users/abcdef/AppData/Local";
    p = p / "Temp"; // move assignment
    const wchar_t* wstr = L"D:/猫.txt";
    p = wstr; // assignment from a source
}

Defect reports

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

DR	Applied to	Behavior as published	Correct behavior
LWG 3244	哋它亢++17	constraint that Source cannot be path was missing	added

See also

assign	assigns contents (public member function)
(constructor)	constructs a path (public member function)