osaDynamicLoaderAndFactory.h

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-    */
/* ex: set filetype=cpp softtabstop=4 shiftwidth=4 tabstop=4 cindent expandtab: */

/*

  Author(s): Peter Kazanzides
  Created on: 2007-01-16 

  (C) Copyright 2007-2007 Johns Hopkins University (JHU), All Rights
  Reserved.

--- begin cisst license - do not edit ---

This software is provided "as is" under an open source license, with
no warranty.  The complete license can be found in license.txt and
http://www.cisst.org/cisst/license.txt.

--- end cisst license ---
*/


#ifndef _osaDynamicLoaderAndFactory_h
#define _osaDynamicLoaderAndFactory_h

#include <typeinfo>
#include <cisstOSAbstraction/osaDynamicLoader.h>
#include <cisstOSAbstraction/osaExport.h>

// This class serves as the base class for osaDynamicLoaderAndFactory and is not
// intended to be accessed otherwise. Note that the constructor is protected.
class CISST_EXPORT osaDynamicLoaderAndFactoryBase : public osaDynamicLoader
{
protected:
    void* create;
    void* destroy;

    osaDynamicLoaderAndFactoryBase() : create(0), destroy(0) {}
    bool Init(const char* name, const char* file, const char* path,
              const std::type_info& tinfo, int version);

public:
    virtual ~osaDynamicLoaderAndFactoryBase() {}

    void Reset();
};

template <class BaseClass>
class osaDynamicLoaderAndFactory : public osaDynamicLoaderAndFactoryBase
{
    typedef BaseClass* CreateFunc();
    typedef void DestroyFunc(BaseClass*);

public:
    osaDynamicLoaderAndFactory() {}
    virtual ~osaDynamicLoaderAndFactory() {}

    bool Init(const char *name, const char *file, const char *path = 0)
    { return osaDynamicLoaderAndFactoryBase::Init(name, file, path, typeid(BaseClass), BaseClass::VERSION); }

    bool Init(const char* name)
    { return osaDynamicLoaderAndFactoryBase::Init(name, name, 0, typeid(BaseClass), BaseClass::VERSION); }

    void Reset()
    { osaDynamicLoaderAndFactoryBase::Reset(); }

    BaseClass* CreateObject() const
    { return create ? (*(reinterpret_cast<CreateFunc*>(create)))() : 0; }

    void DestroyObject(BaseClass* obj) const
    { if (destroy) (*reinterpret_cast<DestroyFunc*>(destroy))(obj); }
};


#endif  // _osaDynamicLoaderAndFactory_h