std::filesystem::path::path - cppreference.com

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# 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, an std::basic_string or an std::basic_string_view, 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, 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`.

### [edit] 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 `InputIterator`s 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`.
- 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))
- The value type of `InputIt` must be char to use the overload (7))

### [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

u8path (C++17) | creates a `path` from a UTF-8 encoded source (function) [edit]

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