NAME

std::filesystem::path::stem - std::filesystem::path::stem

Synopsis

path stem() const; (since C++17)

Returns the filename identified by the generic-format path stripped of its
extension.

Returns the substring from the beginning of filename() up to and not including the
last period (.) character, with the following exceptions:

* If the first character in the filename is a period, that period is
ignored (a filename like ".profile" is not treated as an extension).

* If the filename is one of the special filesystem components dot or
dot-dot, or if it has no periods, the function returns the entire
filename().

Parameters

(none)

Return value

The stem of the filename identified by the path (i.e. the filename without the final
extension).

Exceptions

May throw implementation-defined exceptions.

Example

// Run this code

#include <iostream>
#include <filesystem>
namespace fs = std::filesystem;

int main()
{
for (const fs::path p : {"/foo/bar.txt", "/foo/.bar", "foo.bar.baz.tar"})
std::cout << "path: " << p << ", stem: " << p.stem() << '\n';

std::cout << '\n';

for (fs::path p = "foo.bar.baz.tar"; !p.extension().empty(); p = p.stem())
std::cout << "path: " << p << ", extension: " << p.extension() << '\n';
}

Output:

path: "/foo/bar.txt", stem: "bar"
path: "/foo/.bar", stem: ".bar"
path: "foo.bar.baz.tar", stem: "foo.bar.baz"

path: "foo.bar.baz.tar", extension: ".tar"
path: "foo.bar.baz", extension: ".baz"
path: "foo.bar", extension: ".bar"

See also

filename returns the filename path component
(public member function)
extension returns the file extension path component
(public member function)