#include <filesystem>
#include <fstream>
#include <iostream>
 
namespace fs = std::filesystem;
 
std::string get_stem(const fs::path &p) { return (p.stem().string()); }
void create_file(const fs::path &p) { std::ofstream o{p}; }
 
int main()
{
        const fs::path dir{"tmp_dir"};
        fs::create_directory(dir);
        create_file(dir / "one");
        create_file(dir / "two");
        create_file(dir / "three");
 
        for (const auto &file : fs::directory_iterator(dir)) {
                // 显式转换
                std::cout << get_stem(file.path()) << '\n';
 
                // 隐式转换
                std::cout << get_stem(file) << '\n';
        }
 
        fs::remove_all(dir);
}