IoModuleStaticInitializer.cxx

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// $Id: IoModuleStaticInitializer.cxx,v 1.1 2004/06/20 18:41:46 gmieg Exp $
//
// Each class which inherits from JobModule has a JOBMODULE CPP macro
// which instantiates a file-scope static class whose constructor
// registers the particular JobModule in JobCModuleRegistry::fModLibMap,
// which maps a JobModule identifier into the JobModule class name.
// The identifiers for IoInputModule and IoOutputModule are "INPUT" and
// "Output", respectively.  These classes are instantiated dynamically
// on demand via the JobCModuleRegistry::fModLibMap mapping.
//
// However, the UNIX standard does not specify that unreferenced statics
// should necessarily be initialized when the library is loaded.  While
// Linux extends the standard to initialize such statics, MacOSX's
// MACH-O loader strictly follows the standard in not initializing
// unreferenced statics.  This results in entries for the "INPUT" and
// "Output" identifiers not appearing in JobCModuleRegistry::fModLibMap.
//
// The  IoModuleStaticInitializer class forces initialization of static
// objects in the IoInputModule.cxx and IoOutputModule.cxx files.  The
// IoModuleStaticInitializer class itself is never instantiated.  The
// initialization of statics in IoInputModule and IoOutputModule is
// forced by the following parameter on the executable link line:
//
// -u _gsiomodulestaticinitializer
//
// G. Irwin 18 June 2004

#include "IoModules/IoInputModule.h"
#include "IoModules/IoOutputModule.h"

class IoModuleStaticInitializer
{

public:
  IoModuleStaticInitializer() {
    IoInputModule *iim = new IoInputModule;  delete iim;
    IoOutputModule *iom = new IoOutputModule;  delete iom;
  }
  virtual ~IoModuleStaticInitializer() {;}
};

IoModuleStaticInitializer gsiomodulestaticinitializer;

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