beacon/future_event.hpp

   1 /**
   2  * beacon
   3  * Author: Lukas Krejci <krejci.l@centrum.cz>, (C) 2008
   4  * Copyright: See COPYING file that comes with this distribution
   5  */
   6
   7 #ifndef BEACON_FUTURE_EVENT_H
   8 #define BEACON_FUTURE_EVENT_H
   9
  10 #include <beacon/future.hpp>
  11 #include <beacon/detail/future_event_base.hpp>
  12
  13 namespace beacon {
  14
  15 /**
  16  * An implementation of the future interface that cooperates with
  17  * {@link event_loop}.
  18  */
  19 template<typename ResultType>
  20 class future_event : public future<ResultType>, public detail::future_event_base {
  21     public:
  22
  23         future_event() : future_event_base() {
  24         }
  25
  26         /** currently always fails returning false */
  27         bool cancel() {
  28             return this->future_event_base::cancel();
  29         }
  30
  31         bool finished() const {
  32             return this->future_event_base::finished();
  33         }
  34
  35         ResultType get() throw (execution_exception) {
  36             return static_cast<ResultType>(*(this->future_event_base::get()));
  37         }
  38
  39         ResultType get(int timeout) throw(execution_exception, timeout_exception) {
  40             return static_cast<ResultType>(*(this->future_event_base::get(timeout)));
  41         }
  42 };
  43
  44 template<>
  45 class future_event<void> : public future<void>, public detail::future_event_base {
  46     public:
  47
  48         future_event() : future_event_base() {
  49         }
  50
  51         /** currently always fails returning false */
  52         bool cancel() {
  53             return this->future_event_base::cancel();
  54         }
  55
  56         bool finished() const {
  57             return this->future_event_base::finished();
  58         }
  59
  60         void get() throw (execution_exception) {
  61             this->future_event_base::get();
  62         }
  63
  64         void get(int timeout) throw(execution_exception, timeout_exception) {
  65             this->future_event_base::get();
  66         }
  67 };
  68
  69 }
  70
  71 #endif