std::experimental::filesystem::path::append, (3) - Linux Manuals

std::experimental::filesystem::path::append,: std::experimental::filesystem::path::append,

NAME

std::experimental::filesystem::path::append, - std::experimental::filesystem::path::append,

Synopsis

path& operator/=(const path& p);             (1) (filesystem TS)
template< class Source >                     (2) (filesystem TS)
path& operator/=( const Source& source );
template< class Source >                     (3) (filesystem TS)
path& append( const Source& source );
template< class InputIt >                    (4) (filesystem TS)
path& append( InputIt first, InputIt last );

1) First, appends the preferred directory separator to this, except if any of the
following conditions is true:
* the separator would be redundant (*this already ends with a separator)
* *this is empty, or adding it would turn a relative path to an absolute path in
some other way
* p is an empty path.
* p.native() begins with a directory separator.
Then, appends p.native() to the pathname maintained by *this
2,3) Same as (1), but accepts any std::basic_string, null-terminated multicharacter
string, or an input iterator pointing to a null-terminated multicharacter sequence.
4) Same as (1), but accepts any iterator pair that designates a multicharacter
string.

Parameters

p            - pathname to append
         std::basic_string, null-terminated multicharacter string, or an input
source       - iterator pointing to a null-terminated multicharacter sequence, which
         represents a path name (either in portable or in native format)
first, last  - pair of LegacyInputIterators that specify a multicharacter sequence
         that represents a path name

Type requirements

-
InputIt must meet the requirements of LegacyInputIterator.
-
The value type of InputIt must be one of the encoded character types (char, wchar_t,
char16_t and char32_t)

Return value

*this

Exceptions

May throw filesystem_error on underlying OS API errors or std::bad_alloc if memory
allocation fails.

Example

// Run this code

 #include <iostream>
 #include <experimental/filesystem>
 namespace fs = std::experimental::filesystem;
 int main() {
  fs::path p1 = "C:";
  p1 /= "Users"; // does not insert a separator
           // "C:Users" is a relative path in Windows
           // adding directory separator would turn it to an absolute path
  std::cout << "\"C:\" / \"Users\" == " << p1 << '\n';
  p1 /= "batman"; // inserts fs::path::preferred_separator, '\' on Windows
  std::cout << "\"C:\" / \"Users\" / \"batman\" == " << p1 << '\n';
 }

Possible output:

 "C:" / "Users" == "C:Users"
 "C:" / "Users" / "batman" == "C:Users\batman"