29 Input/output library [input.output]

29.11 File systems [filesystems]

29.11.7 Class path [fs.class.path]

29.11.7.4 Members [fs.path.member]

29.11.7.4.3 Appends [fs.path.append]

The append operations use operator/= to denote their semantic effect of appending preferred-separator when needed.

path& operator/=(const path& p);

Effects: If p.is_absolute() || (p.has_root_name() && p.root_name() != root_name()), then operator=(p).

Otherwise, modifies *this as if by these steps:

(3.1)
If p.has_root_directory(), then removes any root directory and relative path from the generic format pathname. Otherwise, if !has_root_directory() && is_absolute() is true or if has_filename() is true, then appends path::preferred_separator to the generic format pathname.
(3.2)
Then appends the native format pathname of p, omitting any root-name from its generic format pathname, to the native format pathname.

[ Example

Even if //host is interpreted as a root-name, both of the paths path("//host")/"foo" and path("//host/")/"foo" equal "//host/foo" (although the former might use backslash as the preferred separator).

Expression examples:

// On POSIX,
path("foo") /= path("");        // yields path("foo/")
path("foo") /= path("/bar");    // yields path("/bar")

// On Windows,
path("foo") /= path("");        // yields path("foo\\")
path("foo") /= path("/bar");    // yields path("/bar")
path("foo") /= path("c:/bar");  // yields path("c:/bar")
path("foo") /= path("c:");      // yields path("c:")
path("c:") /= path("");         // yields path("c:")
path("c:foo") /= path("/bar");  // yields path("c:/bar")
path("c:foo") /= path("c:bar"); // yields path("c:foo\\bar")

— end example

]

Returns: *this.

🔗

template<class Source>
  path& operator/=(const Source& source);
template<class Source>
  path& append(const Source& source);

Effects: Equivalent to: return operator/=(path(source));

🔗

template<class InputIterator>
  path& append(InputIterator first, InputIterator last);

Effects: Equivalent to: return operator/=(path(first, last));