std::filesystem::path:: stem

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

#include <filesystem>
#include <iostream>
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';
}

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