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+//-----------------------------------------------------------------------------
+// boost variant/detail/apply_visitor_delayed.hpp header file
+// See http://www.boost.org for updates, documentation, and revision history.
+//-----------------------------------------------------------------------------
+//
+// Copyright (c) 2002-2003
+// Eric Friedman
+//
+// 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_APPLY_VISITOR_DELAYED_HPP
+#define BOOST_VARIANT_DETAIL_APPLY_VISITOR_DELAYED_HPP
+
+#include "boost/variant/detail/generic_result_type.hpp"
+
+#include "boost/variant/detail/apply_visitor_unary.hpp"
+#include "boost/variant/detail/apply_visitor_binary.hpp"
+
+namespace boost {
+
+//////////////////////////////////////////////////////////////////////////
+// function template apply_visitor(visitor)
+//
+// Returns a function object, overloaded for unary and binary usage, that
+// visits its arguments using visitor (or a copy of visitor) via
+//  * apply_visitor( visitor, [argument] )
+// under unary invocation, or
+//  * apply_visitor( visitor, [argument1], [argument2] )
+// under binary invocation.
+//
+// NOTE: Unlike other apply_visitor forms, the visitor object must be
+//   non-const; this prevents user from giving temporary, to disastrous
+//   effect (i.e., returned function object would have dead reference).
+//
+
+template <typename Visitor>
+class apply_visitor_delayed_t
+{
+public: // visitor typedefs
+
+    typedef typename Visitor::result_type
+        result_type;
+
+private: // representation
+
+    Visitor& visitor_;
+
+public: // structors
+
+    explicit apply_visitor_delayed_t(Visitor& visitor)
+      : visitor_(visitor)
+    {
+    }
+
+public: // unary visitor interface
+
+    template <typename Visitable>
+        BOOST_VARIANT_AUX_GENERIC_RESULT_TYPE(result_type)
+    operator()(Visitable& visitable)
+    {
+        return apply_visitor(visitor_, visitable);
+    }
+
+public: // binary visitor interface
+
+    template <typename Visitable1, typename Visitable2>
+        BOOST_VARIANT_AUX_GENERIC_RESULT_TYPE(result_type)
+    operator()(Visitable1& visitable1, Visitable2& visitable2)
+    {
+        return apply_visitor(visitor_, visitable1, visitable2);
+    }
+
+};
+
+template <typename Visitor>
+inline apply_visitor_delayed_t<Visitor> apply_visitor(Visitor& visitor)
+{
+    return apply_visitor_delayed_t<Visitor>(visitor);
+}
+
+} // namespace boost
+
+#endif // BOOST_VARIANT_DETAIL_APPLY_VISITOR_DELAYED_HPP