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diff --git a/libsolidity/formal/SMTPortfolio.h b/libsolidity/formal/SMTPortfolio.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/>.
+*/
+
+#pragma once
+
+
+#include <libsolidity/formal/SolverInterface.h>
+
+#include <libsolidity/interface/ReadFile.h>
+
+#include <boost/noncopyable.hpp>
+
+#include <vector>
+
+namespace dev
+{
+namespace solidity
+{
+namespace smt
+{
+
+/**
+ * The SMTPortfolio wraps all available solvers within a single interface,
+ * propagating the functionalities to all solvers.
+ * It also checks whether different solvers give conflicting answers
+ * to SMT queries.
+ */
+class SMTPortfolio: public SolverInterface, public boost::noncopyable
+{
+public:
+	SMTPortfolio(ReadCallback::Callback const& _readCallback);
+
+	void reset() override;
+
+	void push() override;
+	void pop() override;
+
+	void declareFunction(std::string _name, Sort _domain, Sort _codomain) override;
+	void declareInteger(std::string _name) override;
+	void declareBool(std::string _name) override;
+
+	void addAssertion(Expression const& _expr) override;
+	std::pair<CheckResult, std::vector<std::string>> check(std::vector<Expression> const& _expressionsToEvaluate) override;
+
+private:
+	static bool solverAnswered(CheckResult result);
+
+	std::vector<std::shared_ptr<smt::SolverInterface>> m_solvers;
+};
+
+}
+}
+}