text: #ifndef CONCURRENCPP_FORWARD_DECLERATIONS_H
  #define CONCURRENCPP_FORWARD_DECLERATIONS_H
  
  namespace concurrencpp {
  	struct null_result;
  
  	template<class type> class result;
  	template<class type> class result_promise;
  
  	class runtime;
  
  	class timer_queue;
  	class timer;
  
  	class executor;
  	class inline_executor;
  	class thread_pool_executor;
  	class thread_executor;
  	class worker_thread_executor;
  	class manual_executor;
  }
  
  #endif //FORWARD_DECLERATIONS_H
  