Add util::null_ostream

libs/util/include/psemek/util/null_ostream.hpp

@@ -0,0 +1,28 @@
+#pragma once
+
+#include <utility>
+
+namespace psemek::util
+{
+
+	struct null_ostream
+	{
+		null_ostream & write(char const *, std::size_t)
+		{
+			return *this;
+		}
+	};
+
+	template <typename T>
+	null_ostream & operator << (null_ostream & os, T const &)
+	{
+		return os;
+	}
+
+	template <typename T>
+	null_ostream && operator << (null_ostream && os, T const &)
+	{
+		return std::move(os);
+	}
+
+}