class ThreadPool {
  public:
    ThreadPool(int num_threads);
  [...]
}

[...]

public std::optional<ThreadPool> CreateThreadPool(int num_threads) {
    std::optional<ThreadPool> thread_pool_optional (ThreadPool(num_threads)); // warning: Parentheses were disambigued as a function declaration. => credea literalmente ca e function declaration
    std::optional<ThreadPool> thread_pool_optional ((ThreadPool(num_threads))); // cu inca un set de paranteze mergea. WTF??
}