Exception state masking.

IOStreams/EnableExceptions.h

@@ -0,0 +1,38 @@
+static_assert( __cplusplus > 2020'99 );
+
+#pragma once
+
+#include <Alepha/Alepha.h>
+
+namespace Alepha::Hydrogen::IOStreams  ::detail::  EnableExceptions_m
+{
+	inline namespace exports
+	{
+		class EnableExceptions;
+	}
+
+	class exports::EnableExceptions
+	{
+		private:
+			std::ios *ios;
+			std::ios_base::iostate oldState;
+
+		public:
+			~EnableExceptions()
+			{
+				ios->exceptions( oldState );
+			}
+
+			explicit
+			EnableExceptions( std::ios &ios )
+				: ios( &ios ), oldState( ios.exceptions() )
+			{
+				ios.exceptions( std::ios_base::badbit | std::ios_base::failbit );
+			}
+	};
+}
+
+namespace Alepha::Hydrogen::IOStreams::inline exports::inline EnableExceptions_m
+{
+	using namespace detail::EnableExceptions_m::exports;
+}