Method SafeCall

libs/drape_frontend/drape_engine_safe_ptr.hpp:30–35

  template <typename Function, typename... Args>
  void SafeCall(Function && f, Args &&... functionArgs)
  {
    std::lock_guard<std::mutex> lock(m_mutex);
    if (m_engine != nullptr)
      (m_engine.get()->*f)(std::forward<Args>(functionArgs)...);
  }

  template <typename Function, typename... Args>
  dp::DrapeID SafeCallWithResult(Function && f, Args &&... functionArgs)