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+//-----------------------------------------------------------------------------
+// boost variant/detail/forced_return.hpp header file
+// See http://www.boost.org for updates, documentation, and revision history.
+//-----------------------------------------------------------------------------
+//
+// Copyright (c) 2003 Eric Friedman
+// Copyright (c) 2015-2016 Antony Polukhin
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_VARIANT_DETAIL_FORCED_RETURN_HPP
+#define BOOST_VARIANT_DETAIL_FORCED_RETURN_HPP
+
+#include <boost/config.hpp>
+#include <boost/variant/detail/generic_result_type.hpp>
+#include <boost/assert.hpp>
+#include <cstdlib> // std::abort
+
+
+#ifdef BOOST_MSVC
+# pragma warning( push )
+# pragma warning( disable : 4702 ) // unreachable code
+#endif
+
+namespace boost { namespace detail { namespace variant {
+
+BOOST_NORETURN inline void forced_return_no_return() { // fixes `must return a value` warnings
+    using namespace std;
+    abort(); // some implementations have no std::abort
+}
+
+
+///////////////////////////////////////////////////////////////////////////////
+// (detail) function template forced_return
+//
+// Logical error to permit invocation at runtime, but (artificially) satisfies
+// compile-time requirement of returning a result value.
+//
+template <typename T>
+BOOST_NORETURN inline
+    BOOST_VARIANT_AUX_GENERIC_RESULT_TYPE(T)
+forced_return()
+{
+    // logical error: should never be here! (see above)
+    BOOST_ASSERT(false);
+
+    forced_return_no_return();
+
+#ifdef BOOST_NO_NORETURN
+    BOOST_VARIANT_AUX_GENERIC_RESULT_TYPE(T) (*dummy)() = 0;
+    return dummy();
+#endif
+}
+
+}}} // namespace boost::detail::variant
+
+
+#ifdef BOOST_MSVC
+# pragma warning( pop )
+#endif
+
+#endif // BOOST_VARIANT_DETAIL_FORCED_RETURN_HPP