5. Noncopyable dengan Generics

// Generic function yang menerima noncopyable type
func withResource<R: ~Copyable, Result>(
    _ resource: consuming R,
    body: (borrowing R) throws -> Result
) rethrows -> Result {
    defer { _ = consume resource }  // cleanup setelah body
    return try body(resource)
}

// Penggunaan:
let result = withResource(FileHandle(path: "/tmp/data.txt")!) { handle in
    handle.read(count: 100)
}
// FileHandle otomatis di-close setelah withResource selesai