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PluginLoader.h

/*****************************************************************************
 * Author:   Valient Gough <vgough@pobox.com>
 *
 *****************************************************************************
 * Copyright (c) 2001, Valient Gough
 *
 * This library is free software; you can distribute it and/or modify it under
 * the terms of the GNU Lesser General Public License (LGPL), as published by
 * the Free Software Foundation; either version 2.1 of the License, or (at your
 * option) any later version.
 *
 * This library 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 LGPL in the file COPYING for more
 * details.
 *
 */

#ifndef _PluginLoader_incl_
#define _PluginLoader_incl_

#include <rel/SmartPtr.h>

#include <string>

namespace rel
{

    class PluginLoader
    {
    public:
        PluginLoader(const std::string &fileName);
        ~PluginLoader();

        typedef OpaqueValue (*func_t)(const OpaqueValue *);

        func_t lookupFunction(const char *funcName);

    private:
        bool loadPlugin();

        struct PluginLoaderImpl *impl;
    };

    class PluginEntryPoint
    {
    public:
        PluginEntryPoint(const std::string &entryPointName, 
                const SmartPtr<PluginLoader> &plugin);
        ~PluginEntryPoint();

        bool execute(const OpaqueValue *args, OpaqueValue *output);

    private:
        struct PluginEntryPointImpl *impl;
    };


    // Redefine how smart pointer interpret is implemented.  This makes it so
    // that a PluginEntryPoint may be inserted into a map to transparently act
    // as a conduit for that plugin call.
    template<>
        bool smartPtrInterpret<PluginEntryPoint>(PluginEntryPoint *value,
                const std::type_info &outputType,
                const OpaqueValue *args,
                OpaqueValue *output);


} // namespace rel

#endif

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