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+/*
+	This file is part of cpp-ethereum.
+
+	cpp-ethereum 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.
+
+	cpp-ethereum 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 cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/** @file GasMeter.cpp
+ * @author Christian <c@ethdev.com>
+ * @date 2015
+ */
+
+#pragma once
+
+#include <ostream>
+#include <libevmasm/AssemblyItem.h>
+
+namespace dev
+{
+namespace eth
+{
+
+/**
+ * Class that helps computing the maximum gas consumption for instructions.
+ */
+class GasMeter
+{
+public:
+	struct GasConsumption
+	{
+		GasConsumption(u256 _value = 0, bool _infinite = false): value(_value), isInfinite(_infinite) {}
+		static GasConsumption infinite() { return GasConsumption(0, true); }
+
+		GasConsumption& operator+=(GasConsumption const& _otherS);
+		std::ostream& operator<<(std::ostream& _str) const;
+
+		u256 value;
+		bool isInfinite;
+	};
+
+	/// Returns an upper bound on the gas consumed by the given instruction.
+	GasConsumption estimateMax(AssemblyItem const& _item);
+
+private:
+	static GasConsumption runGas(Instruction _instruction);
+};
+
+inline std::ostream& operator<<(std::ostream& _str, GasMeter::GasConsumption const& _consumption)
+{
+	if (_consumption.isInfinite)
+		return _str << "inf";
+	else
+		return _str << _consumption.value;
+}
+
+
+}
+}