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std::filesystem::u8path(3) C++ Standard Libary std::filesystem::u8path(3) NAME std::filesystem::u8path - std::filesystem::u8path Synopsis Defined in header <filesystem> template< class Source > (1) (since C++17) std::filesystem::path u8path( const Source& source ); (dep- recated in C++20) template< class InputIt > (since C++17) std::filesystem::path u8path( InputIt first, InputIt last (2) (dep- recated in C++20) ); Constructs a path p from a UTF-8 encoded sequence of chars or char8_ts (since C++20), supplied either as an std::string, or as std::string_view, or as a null-terminated multibyte string, or as a [first, last) iterator pair. * If path::value_type is char and native encoding is UTF-8, con- structs a path directly as if by path(source) or path(first, last). Note: this is the typical situation of a POSIX system that uses Unicode, such as Linux. * Otherwise, if path::value_type is wchar_t and native encoding is UTF-16 (this is the situation on Windows), or if path::value_type is char16_t (native encoding guaranteed UTF-16) or char32_t (native encoding guaranteed UTF-32), then first converts the UTF-8 character sequence to a temporary string tmp of type path::string_type and then the new path is constructed as if by path(tmp) * Otherwise (for non-UTF-8 narrow character encodings and for non- UTF-16 wchar_t), first converts the UTF-8 character sequence to a temporary UTF-32-encoded string tmp of type std::u32string, and then the new path is constructed as if by path(tmp) (this path is taken on a POSIX system with a non-Uni- code multibyte or single-byte encoded filesystem) Parameters a UTF-8 encoded std::string, std::string_view, a pointer to a source - null-terminated multibyte string, or an input iterator with char value type that points to a null-terminated multibyte string first, last - pair of LegacyInputIterators that specify a UTF-8 en- coded character sequence Type requirements - InputIt must meet the requirements of LegacyInputIterator. - The value type of Source or InputIt must be char or char8_t (since C++20) Return value The path constructed from the input string after conversion from UTF-8 to the filesystem's native character encoding. Exceptions May throw std::bad_alloc if memory allocation fails. Notes On systems where native path format differs from the generic path format (neither Windows nor POSIX systems are examples of such OSes), if the argu- ment to this function is using generic format, it will be converted to native. Example // Run this code #include <cstdio> #ifdef _MSC_VER #include <io.h> #include <fcntl.h> #else #include <locale> #include <clocale> #endif #include <fstream> #include <filesystem> int main() { #ifdef _MSC_VER _setmode(_fileno(stderr), _O_WTEXT); #else std::setlocale(LC_ALL, ""); std::locale::global(std::locale("")); #endif std::filesystem::path p(u8".txt"); std::ofstream(p) << "File contents"; // Prior to LWG2676 uses op- erator string_type() // on MSVC, where string_type is wstring, only // works due to non-standard extension. // Post-LWG2676 uses new fstream constructors // native string representation can be used with OS APIs if (std::FILE* f = #ifdef _MSC_VER _wfopen(p.c_str(), L"r") #else std::fopen(p.c_str(), "r") #endif ) { int ch; while((ch=fgetc(f)) != EOF) putchar(ch); std::fclose(f); } std::filesystem::remove(p); } Possible output: File contents See also path represents a path (C++17) (class) http://cppreference.com 2022.07.31 std::filesystem::u8path(3)
NAME | Synopsis | Parameters | Type requirements | Return value | Exceptions | Notes | Example | Possible output: | See also
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