std::filesystem::path::string, std::filesystem::path::wstring, std::filesystem::path::u8string, std::filesystem::path::u16string, std::filesystem::path::u32string (original) (raw)

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 is char, conversion, if any, is system-dependent. This is the case on typical POSIX systems (such as Linux), where native encoding is UTF-8 and string() performs no conversion.
Otherwise, if path::value_type is wchar_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 is char16_t, native encoding is UTF-16 and the conversion method is unspecified.
Otherwise, if path::value_type is char32_t, native encoding is UTF-32 and the conversion method is unspecified.
Otherwise, if path::value_type is char8_t, native encoding is UTF-8 and the conversion method is unspecified.

(none)

The internal pathname in native pathname format, converted to specified string type.

May throw implementation-defined exceptions.

#include #include #include #include #include #include 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")) { for (int ch; (ch = std::fgetc(f)) != EOF;) std::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++ (as per gcc-12.1.0), see: // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95048 // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102839 // works with more recent gcc-12.2.1 (2023/02/01) and clang-10+ 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