std::filesystem::path::path
From cppreference.com
< cpp | filesystem | path
| path();
|
(1) | (since C++17) |
| path( const path& p );
|
(2) | (since C++17) |
| path( path&& p );
|
(3) | (since C++17) |
| template< class Source >
path( const Source& source ); |
(4) | (since C++17) |
| template< class InputIt >
path( InputIt first, InputIt last ); |
(5) | (since C++17) |
| template< class Source >
path( const Source& source, const std::locale& loc ); |
(6) | (since C++17) |
| template< class InputIt >
path( InputIt first, InputIt last, const std::locale& loc ); |
(7) | (since C++17) |
Constructs a new path object.
1) Constructs an empty path.
2) Copy constructor. Constructs a copy of
p.
3) Move constructor. Constructs a copy of
p, p is left in valid but unspecified state.
4-5) Constructs the path from a character sequence provided by
source (4), which is a pointer or an input iterator to a null-terminated character/wide character sequence or an std::basic_string, or represented as a pair of input iterators [first, last) (5). Any of the four character types char, 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)
- 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)
6-7) Constructs the path from a character sequence provided by
source (6), which is a pointer or an input iterator to a null-terminated character sequence or an std::string, 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.
Contents |
[edit] Parameters
| p | - | a path to copy |
| source | - | a std::basic_string, pointer to a null-terminated character string, or an 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 InputIterators that specify a UTF-8 encoded character sequence
|
| loc | - | locale that defines encoding conversion to use |
| Type requirements | ||
-
InputIt must meet the requirements of InputIterator.
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-The value type of InputIt must be one of the four character types char, wchar_t, char16_t and char32_t to use the overload (5))
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-The value type of InputIt must be char to use the overload (7))
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[edit] Exceptions
1-2) (none)
3)
noexcept specification:
noexcept
4-7) (none)
[edit] Notes
For portable pathname generation from Unicode strings, see u8path.
[edit] 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\\"; // 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"
[edit] See also
| (C++17)
|
creates a path from a UTF-8 encoded source (function) |