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std::filesy...::path::path(3) C++ Standard Libarystd::filesy...::path::path(3) NAME std::filesystem::path::path - std::filesystem::path::path Synopsis path() noexcept; (1) (since C++17) path( const path& p ); (2) (since C++17) path( path&& p ) noexcept; (3) (since C++17) path( string_type&& source, format fmt = auto_format ); (4) (since C++17) template< class Source > (5) (since C++17) path( const Source& source, format fmt = auto_format ); template< class InputIt > (6) (since C++17) path( InputIt first, InputIt last, format fmt = auto_format ); template< class Source > path( const Source& source, const std::locale& loc, format fmt = (7) (since C++17) auto_format ); template< class InputIt > path( InputIt first, InputIt last, const std::locale& loc, format (8) (since C++17) fmt = auto_format ); Constructs a new path object. 1) Constructs an empty path. 2) Copy constructor. Constructs a path whose pathname, in both na- tive and generic formats, is the same as that of p 3) Move constructor. Constructs a path whose pathname, in both na- tive and generic formats, is the same as that of p, p is left in valid but unspeci- fied state. 4-6) Constructs the path from a character sequence (format inter- preted as specified by fmt) provided by source (4,5), which is a pointer or an input it- erator to a null-terminated character/wide character sequence, an std::ba- sic_string or an std::basic_string_view, or represented as a pair of input iterators [first, last) (6). Any of the character types char, char8_t, (since C++20)char16_t, char32_t, wchar_t is allowed, and the method of conversion to the native character set depends on the character type used by source * If the source character type is char, the encoding of the source is assumed to be the native narrow encoding (so no conver- sion takes place on POSIX systems) * If the source character type is char8_t, conversion from UTF-8 (since C++20) to native filesystem encoding is used. * If the source character type is char16_t, conversion from UTF-16 to native filesystem encoding is used. * If the source character type is char32_t, conversion from UTF-32 to native filesystem encoding is used. * If the source character type is wchar_t, the input is assumed to be the native wide encoding (so no conversion takes places on Windows) 7-8) Constructs the path from a character sequence (format inter- preted as specified by fmt) provided by source (7), which is a pointer or an input iter- ator to a null-terminated character sequence, an std::string, an std::ba- sic_string_view, or represented as a pair of input iterators [first, last) (8). The only character type allowed is char. Uses loc to perform the character encoding conver- sion. If value_type is wchar_t, converts from to wide using the std::codecvt<wchar_t, char, std::mbstate_t> facet of loc. Otherwise, first converts to wide us- ing the std::codecvt<wchar_t, char, std::mbstate_t> facet and then converts to filesystem native character type using std::codecvt<wchar_t,value_type> facet of loc. (5) and (7) participate 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::ba- sic_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 C++20)char16_t, char32_t, or wchar_t). Parameters p - a path to copy std::basic_string, std::basic_string_view, pointer to a source - null-terminated character string, or input iterator with a character value type that points to a null-terminated character sequence (the character type must be char for overload (7)) first, last - pair of LegacyInputIterators that specify a character sequence fmt - enumerator of type path::format which specifies how pathname format is to be interpreted loc - locale that defines encoding conversion to use Type requirements - InputIt must meet the requirements of LegacyInputIterator. - The value type of InputIt must be one of the character types char, wchar_t, char8_t, (since C++20)char16_t and char32_t to use the overload (6) - The value type of InputIt must be char to use the overload (8) Exceptions 2, 4-8) May throw implementation-defined exceptions. Notes For portable pathname generation from Unicode strings, see u8path. (until C++20) path constructor supports creation from UTF-8 string when the source (since C++20) is a sequence of char8_t. Example // Run this code #include <iostream> #include <filesystem> namespace fs = std::filesystem; int main() { fs::path p1 = "/usr/lib/sendmail.cf"; // portable format fs::path p2 = "C:\\users\\abcdef\\AppData\\Local\\Temp\\"; // na- tive format fs::path p3 = U"D:/.txt"; // UTF-32 string fs::path p4 = u8"~/.txt"; // UTF-8 string std::cout << "p1 = " << p1 << '\n' << "p2 = " << p2 << '\n' << "p3 = " << p3 << '\n' << "p4 = " << p4 << '\n'; } Output: p1 = "/usr/lib/sendmail.cf" p2 = "C:\\users\\abcdef\\AppData\\Local\\Temp\\" p3 = "D:/.txt" p4 = "~/.txt" Defect reports The following behavior-changing defect reports were applied retroac- tively to previously published C++ standards. DR Applied to Behavior as published Correct behavior LWG 3244 C++17 constraint that Source cannot be path was added missing See also u8path creates a path from a UTF-8 encoded source (C++17)(deprecated in C++20) (function) http://cppreference.com 2022.07.31 std::filesy...::path::path(3)
NAME | Synopsis | Parameters | Type requirements | Exceptions | Notes | Example | Output: | See also
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