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// demo_polymorphic_A.hpp

// (C) Copyright 2002 Robert Ramey - .
// Use, modification and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at

namespace boost {
namespace archive {

class polymorphic_iarchive;
class polymorphic_oarchive;

} // namespace archive
} // namespace boost

struct A {
    // class a contains a pointer to a "hidden" declaration
    template<class Archive>
    void serialize(
        Archive & ar,
        const unsigned int file_version
        ar & data;
    int data;
    bool operator==(const A & rhs) const {
        return data ==;
    A() :