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// demo_pimpl_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

// class whose declaration is hidden by a pointer
struct B;

struct A {
    // class a contains a pointer to a "hidden" declaration
    B *pimpl;
    template<class Archive>
    void serialize(Archive & ar, const unsigned int file_version);