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std::experimental::filesystem::path::extension

From cppreference.com
< cpp‎ | experimental‎ | fs‎ | path
 
 
Technical specifications
Filesystem library (filesystem TS)
Library fundamentals (library fundamentals TS)
Library fundamentals 2 (library fundamentals TS v2)
Library fundamentals 3 (library fundamentals TS v3)
Extensions for parallelism (parallelism TS)
Extensions for parallelism 2 (parallelism TS v2)
Extensions for concurrency (concurrency TS)
Concepts (concepts TS)
Ranges (ranges TS)
Mathematical special functions (special functions TR)
 
 
 
path extension() const;
(filesystem TS)

Returns the extension of the filename component of the path *this.

If the filename() component of the path contains a period (.), and is not one of the special filesystem elements dot or dot-dot, then the extension is the substring beginning at the rightmost period (including the period) and until the end of the pathname.

If the pathname is either . or .., or if filename() does not contain the . character, then empty path is returned.

Additional behavior may be defined by the implementations for file systems which append additional elements (such as alternate data streams or partitioned dataset names) to extensions.

Contents

[edit] Parameters

(none)

[edit] Return value

The extension of the current pathname or an empty path if there's no extension.

[edit] Exceptions

(none)

[edit] Notes

The extension as returned by this function includes a period to make it possible to distinguish the file that ends with a period (function returns ".") from a file with no extension (function returns "")

For any path p, p.stem()+p.extension() == p.filename()

[edit] Example

#include <iostream>
#include <experimental/filesystem>
namespace fs = std::experimental::filesystem;
 
int main()
{
    std::cout << fs::path("/foo/bar.txt").extension() << '\n'
              << fs::path("/foo/bar.").extension() << '\n'
              << fs::path("/foo/bar").extension() << '\n'
              << fs::path("/foo/bar.txt/bar.cc").extension() << '\n'
              << fs::path("/foo/bar.txt/bar.").extension() << '\n'
              << fs::path("/foo/bar.txt/bar").extension() << '\n'
              << fs::path("/foo/.").extension() << '\n'
              << fs::path("/foo/..").extension() << '\n'
              << fs::path("/foo/.hidden").extension() << '\n';
}

Output:

".txt"
"."
""
".cc"
"."
""
""
""
".hidden"

[edit] See also

returns the filename path component
(public member function) [edit]
returns the stem path component
(public member function) [edit]
replaces the extension
(public member function) [edit]
checks if the corresponding path element is not empty
(public member function)