std::filesystem::path::generic_string, std::filesystem::path::generic_wstring, std::filesystem::path::generic_u8string, std::filesystem::path::generic_u16string, std::filesystem::path::generic_u32string
template< class CharT, class Traits = std::char_traits<CharT>, class Alloc = std::allocator<CharT> > std::basic_string<CharT,Traits,Alloc> generic_string( const Alloc& a = Alloc() ) const; |
(1) | (since C++17) |
(2) | (since C++17) | |
std::string generic_string() const; |
||
std::wstring generic_wstring() const; |
||
std::u16string generic_u16string() const; |
||
std::u32string generic_u32string() const; |
||
(3) | ||
std::string generic_u8string() const; |
(since C++17) (until C++20) |
|
std::u8string generic_u8string() const; |
(since C++20) |
Returns the internal pathname in generic pathname format, converted to specific string type. Conversion, if any, is specified as follows:
- If
path::value_type
ischar
, conversion, if any, is system-dependent. This is the case on typical POSIX systems (such as Linux), where native encoding is UTF-8 andstring()
performs no conversion. - Otherwise, if
path::value_type
iswchar_t
, conversion, if any, is unspecified. This is the case on Windows, where wchar_t is 16 bit and the native encoding is UTF-16. - Otherwise, if
path::value_type
ischar16_t
, native encoding is UTF-16 and the conversion method is unspecified. - Otherwise, if
path::value_type
ischar32_t
, native encoding is UTF-32 and the conversion method is unspecified. - Otherwise, if
path::value_type
ischar8_t
, native encoding is UTF-8 and the conversion method is unspecified.
The /
character is used as the directory separator.
1) All memory allocations are performed by
a
.
3) The result encoding in the case of
u8string()
is always UTF-8.
Parameters
a | - | allocator to construct the string with |
Type requirements | ||
-CharT must be one of the encoded character types (char , wchar_t , char8_t (since C++20), char16_t and char32_t ) |
Return value
The internal pathname in generic pathname format, converted to specified string type.
Exceptions
May throw implementation-defined exceptions.
Example
#include <cstddef> #include <filesystem> #include <iomanip> #include <iostream> #include <span> #include <string_view> void print(std::string_view rem, auto const& str) { std::cout << rem << std::hex << std::uppercase << std::setfill('0'); for (const auto b : std::as_bytes(std::span{str})) { std::cout << std::setw(2) << std::to_integer<unsigned>(b) << ' '; } std::cout << '\n'; } int main() { std::filesystem::path p{"/家/屋"}; std::cout << p << '\n'; print("string : ", p.generic_string ()); print("u8string : ", p.generic_u8string ()); print("u16string : ", p.generic_u16string()); print("u32string : ", p.generic_u32string()); // print("wstring : ", p.generic_wstring ()); // gcc-11.0.0 2020.12.30 still fails, clang-10 - ok }
Possible output:
"/家/屋" string : 2F E5 AE B6 2F E5 B1 8B u8string : 2F E5 AE B6 2F E5 B1 8B u16string : 2F 00 B6 5B 2F 00 4B 5C u32string : 2F 00 00 00 B6 5B 00 00 2F 00 00 00 4B 5C 00 00
See also
returns the path in native pathname format converted to a string (public member function) |
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