main::shim::stack: Use internal stack manager access am: e24a9572

  // Run the callable object on the module instance

  template <typename T>

  bool CallOnModule(std::function<void(T* mod)> run) {

    std::lock_guard<std::recursive_mutex> lock(Stack::GetInstance()->mutex_);

    if (Stack::GetInstance()->is_running_) {

      run(Stack::GetInstance()->GetStackManager()->GetInstance<T>());

      return true;

    std::lock_guard<std::recursive_mutex> lock(mutex_);

    if (is_running_) {

      run(stack_manager_.GetInstance<T>());

    }

    return false;

    return is_running_;

  }

  size_t NumModules() const { return num_modules_; }