What is std::filesystem?

Question

Accepted Answer

**std::filesystem** — file system operations (C++17).

```cpp
#include <filesystem>
namespace fs = std::filesystem;

// Directory iteration
for (const auto& entry : fs::directory_iterator("/path")) {
    std::cout << entry.path() << "
";
}

// File operations
fs::copy("src.txt", "dst.txt");
fs::remove("file.txt");
fs::create_directories("a/b/c");

// File info
auto size = fs::file_size("file.txt");
auto last_write = fs::last_write_time("file.txt");
bool exists = fs::exists("file.txt");
```

**Path manipulation:**
```cpp
fs::path p = "/home/user/file.txt";
p.filename();  // "file.txt"
p.stem();      // "file"
p.extension(); // ".txt"
p.parent_path(); // "/home/user"
```

C++: What is std::filesystem?