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include/platform/async/future.h

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+/* -----------------------------------------------------------------------------
+	GSFramework
+	Copyright 2001-2013 Emmanuel Julien. All Rights Reserved.
+----------------------------------------------------------------------------- */
+
+
+#ifndef	__NFUTURE__
+#define	__NFUTURE__
+
+
+		#include "thread/atomic_value.h"
+		#include "memory/nshared_ptr.h"
+
+
+namespace GS {
+	namespace ASync {
+
+/*
+	@short	Future.
+	@author	Emmanuel Julien (ejulien@nworks.fr)
+*/
+template <class T> class Future
+{
+		T			value;
+		Threading::Atomic32	set;
+
+public:
+
+		bool		IsSet() const
+		{	return set.Get() == 1;	}
+		void		Set(const T &_value)
+		{
+			value = _value;
+			set.Set(1);
+		}
+
+		void		Wait()
+		{	while (!IsSet());	}
+	
+		T			&Get()
+		{
+			Wait();
+			return value;
+		}
+};
+
+//
+template <> class Future <void>
+{
+		Threading::Atomic32	set;
+
+public:
+
+		bool		IsSet() const
+		{	return set.Get() == 1;	}
+		void		Set()
+		{	set.Set(1);	}
+
+		void		Wait()
+		{	while (!IsSet());	}
+};
+
+	} // ASync
+} // GS
+
+
+#endif	// __NFUTURE__