View source for cpp/filesystem/is empty

===Example===
{{example
|code=
#include <cstdio>
#include <filesystem>
#include <fstream>
#include <iostream>

int main()
{
    namespace fs = std::filesystem;

    const fs::path tmp_dir{fs::temp_directory_path()};
    std::cout << std::boolalpha
              << "Temp dir: " << tmp_dir << '\n'
              << "is_empty(): " << fs::is_empty(tmp_dir) << '\n';

    const fs::path tmp_name{tmp_dir / std::tmpnam(nullptr)};
    std::cout << "Temp file: " << tmp_name << '\n';

    std::ofstream file{tmp_name.string()};
    std::cout << "is_empty(): " << fs::is_empty(tmp_name) << '\n';
    file << "cppreference.com";
    file.flush();
    std::cout << "is_empty(): " << fs::is_empty(tmp_name) << '\n'
              << "file_size(): " << fs::file_size(tmp_name) << '\n';
    file.close();
    fs::remove(tmp_name);
}
|p=true
|output=
Temp dir: "/tmp"
is_empty(): false
Temp file: "/tmp/fileCqd9DM"
is_empty(): true
is_empty(): false
file_size(): 16
}}