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diff --git a/libevmasm/SimplificationRule.h b/libevmasm/SimplificationRule.h
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+/*
+	This file is part of solidity.
+
+	solidity is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	solidity is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/**
+ * Expression simplification pattern.
+ */
+
+#pragma once
+
+#include <functional>
+
+namespace dev
+{
+namespace solidity
+{
+
+/**
+ * Rule that contains a pattern, an action that can be applied
+ * after the pattern has matched and a bool that indicates
+ * whether the action would remove something from the expression
+ * than is not a constant literal.
+ */
+template <class Pattern>
+struct SimplificationRule
+{
+	Pattern pattern;
+	std::function<Pattern()> action;
+	bool removesNonConstants;
+};
+
+}
+}