TypeIDBase.h

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#ifndef FWCore_Utilities_TypeIDBase_h
#define FWCore_Utilities_TypeIDBase_h
// -*- C++ -*-
//
// Package:     Utilities
// Class  :     TypeIDBase
// 
//
// Original Author:  Chris Jones
//         Created:  Thu Nov 10 14:59:35 EST 2005
//

// system include files
#include <typeinfo>

// user include files

// forward declarations
namespace edm {
   class TypeIDBase 
   {
   
    public:
      struct Def { };
   
      TypeIDBase() :
         t_(&(typeid(Def))) 
      { }
      
      explicit TypeIDBase(const std::type_info& t) :
         t_(&t)
      { }
            
      explicit TypeIDBase(const std::type_info* t) :
         t_(t == 0 ? &(typeid(Def)) : t)
      { }
            
      // ---------- const member functions ---------------------
      
      const char* name() const { return t_->name(); }
      
      bool operator<(const TypeIDBase& b) const { return t_->before(*(b.t_)); }
      bool operator==(const TypeIDBase& b) const { return (*t_) == *(b.t_); }

    protected:
      const std::type_info& typeInfo() const {return *t_;}

    private:
   
      //const TypeIDBase& operator=(const TypeIDBase&); // stop default

      // ---------- member data --------------------------------
      //NOTE: since the compiler generates the type_info's and they have a lifetime
      //  good for the entire application, we do not have to delete it
      //  We also are using a pointer rather than a reference so that operator= will work
      const std::type_info* t_;
   };

   inline bool operator>(const TypeIDBase& a, const TypeIDBase& b)
   { return b<a; }
   
   inline bool operator!=(const TypeIDBase& a, const TypeIDBase& b)
   { return !(a==b); }
   
}

#endif