std::filesystem::path::string, std::filesystem::path::wstring, std::filesystem::path::u8string, std::filesystem::path::u16string, std::filesystem::path::u32string
template< class CharT, class Traits = std::char_traits<CharT>, class Alloc = std::allocator<CharT> > std::basic_string<CharT,Traits,Alloc> string( const Alloc& a = Alloc() ) const; |
(1) | (since C++17) |
(2) | (since C++17) | |
std::string string() const; |
||
std::wstring wstring() const; |
||
std::u16string u16string() const; |
||
std::u32string u32string() const; |
||
(3) | ||
std::string u8string() const; |
(since C++17) (until C++20) |
|
std::u8string u8string() const; |
(since C++20) |
Returns the internal pathname in native pathname format, converted to specific string type. Conversion, if any, is performed 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.
1) All memory allocations are performed by
a
.
3) The result encoding in the case of
u8string()
is always UTF-8.
Parameters
(none).
Return value
The internal pathname in native pathname format, converted to specified string type.
Exceptions
May throw implementation-defined exceptions.
Example
#include <cstdio> #include <clocale> #include <filesystem> #include <fstream> #include <iostream> #include <locale> int main() { const char* const localeName = "ja_JP.utf-8"; std::setlocale(LC_ALL, localeName); std::locale::global(std::locale(localeName)); const std::filesystem::path p(u8"要らない.txt"); std::ofstream(p) << "File contents"; // native string representation can be used with OS APIs if (std::FILE* const f = std::fopen(p.string().c_str(), "r")) { int ch; while ((ch = fgetc(f)) != EOF) putchar(ch); std::fclose(f); } // multibyte and wide representation can be used for output std::cout << "\nFile name in narrow multibyte encoding: " << p.string() << '\n'; // wstring() will throw in stdlibc++, see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102839 std::wcout << "File name in wide encoding: " << p.wstring() << '\n'; std::filesystem::remove(p); }
Possible output:
File contents File name in narrow multibyte encoding: 要らない.txt File name in wide encoding: 要らない.txt
See also
returns the path in generic pathname format converted to a string (public member function) |
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