Some thread interruption defensiveness.

Utility/ScopedState.h

@@ -0,0 +1,28 @@
+static_assert( __cplusplus > 2020'00 );
+
+#pragma once
+
+#include <Alepha/Alepha.h>
+
+#include <boost/noncopyable.hpp>
+
+namespace Alepha::Hydrogen::Utility  ::detail::  ScopedState_m
+{
+	inline namespace exports
+	{
+		class ScopedState : boost::noncopyable
+		{
+			private:
+				bool &state;
+
+			public:
+				~ScopedState() { state= false; }
+				explicit ScopedState( bool &state ) : state( state ) { state= true; }
+		};
+	}
+}
+
+namespace Alepha::Hydrogen::Utility::inline exports::inline ScopedState_m
+{
+	using namespace detail::ScopedState_m::exports;
+}