[gmpi] Linux C++ question
- From: Jeff McClintock <jeffmcc@xxxxxxxxxx>
- To: gmpi@xxxxxxxxxxxxx
- Date: Thu, 24 Feb 2005 10:14:05 +1300
A question for someone familier (very familier) with C++ on Linux.
A GMPI dll may contain several plugins. In the GMPI prototype. An
object called the factory maintains a list. There is only ever one
factory. I used a singleton to implement such. However Tim reports
that it crashes while unloading the dll. Any help appreciated.
details:
The technique comes from "Modern C++ Design - Andrei Alexandrescu",
author of the Loki library.
This is the essential code. Ignore the GMPIness of this...If you want
to see the entire file, let me know.
/* factory is a singleton, this retrieves a pointer to it */
GMPI_Factory *Factory(void)
{
static GMPI_Factory the_factory;
return &the_factory;
}
/* register a plugin with this factory */
GMPI_RESULT GMPI_Factory::RegisterPlugin( const GMPI_GUID *iid,
PLUGIN_CREATE_FUNCTION create_function )
{
plugin_list.push_back( pair<const GMPI_GUID
*,PLUGIN_CREATE_FUNCTION>(iid, create_function) );
return GMPI_SUCCESS;
}
/* Instantiate a GMPI_Plugin */
GMPI_RESULT GMPI_Factory::CreateInstance( GMPI_GUID *plugin_id, void
**object )
{
/* search plugin list for requested type */
for( list< pair<const GMPI_GUID *,PLUGIN_CREATE_FUNCTION> >::iterator
it = plugin_list.begin() ; it != plugin_list.end() ; it++ )
{
if( GIMPI_IsEqualIID( plugin_id, (*it).first ) )
{
/* call plugin create function */
GMPI_Plugin *plugin = ((*it).second)();
if (plugin == 0)
{
*object = 0;
return GMPI_FAIL;// E_OUTOFMEMORY;
}
return plugin->QueryInterface( (GMPI_GUID *) &IID_GMPI_IUnknown ,
object );
}
}
/* couln't find requested type, return error */
*object = 0;
return GMPI_FAIL;
}
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