std::filesystem::path::path
std::filesystem::path::path
|
(1) | (since C++17) |
|
(2) | (since C++17) |
|
(3) | (since C++17) |
|
(4) | (since C++17) |
|
(5) | (since C++17) |
|
(6) | (since C++17) |
|
(7) | (since C++17) |
|
(8) | (since C++17) |
Constructs a new path
object.
1) Constructs an empty path.
2) Copy constructor. Constructs a path whose pathname, in both native and generic formats, is the same as that of p
3) Move constructor. Constructs a path whose pathname, in both native and generic formats, is the same as that of p
, p
is left in valid but unspecified state.
4-6) Constructs the path from a character sequence (format interpreted as specified by fmt
) provided by source
(4,5), which is a pointer or an input iterator to a null-terminated character/wide character sequence, an std::basic_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 conversion takes place on POSIX systems)
|
(since C++20) |
- 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 interpreted as specified by fmt
) provided by source
(6), which is a pointer or an input iterator to a null-terminated character sequence, an std::string
, an std::basic_string_view
, or represented as a pair of input iterators [first
, last
) ((7)). The only character type allowed is char
. Uses loc
to perform the character encoding conversion. 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 using 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
.
Parameters
p | - | a path to copy |
source | - | std::basic_string , std::basic_string_view , pointer to a 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 (6))
|
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 (5))
|
||
-The value type of InputIt must be char to use the overload (7))
|
Exceptions
2, 4-8) (none)
Notes
For portable pathname generation from Unicode strings, see u8path. | (until C++20) |
path constructor supports creation from UTF-8 string when the source is a sequence of char8_t .
|
(since C++20) |
Example
#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\\"; // native format
fs::path p3 = L"D:/猫.txt"; // wide string
std::cout << "p1 = " << p1 << '\n'
<< "p2 = " << p2 << '\n'
<< "p3 = " << p3 << '\n';
}
Output:
p1 = "/usr/lib/sendmail.cf"
p2 = "C:\users\abcdef\AppData\Local\Temp\"
p3 = "D:/猫.txt"
See also
(C++17)(deprecated in C++20) |
creates a path from a UTF-8 encoded source(function) |
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