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// @(#)root/reflex:$Id: Base.h 29288 2009-07-01 13:03:35Z axel $
// Author: Stefan Roiser 2004

// Copyright CERN, CH-1211 Geneva 23, 2004-2006, All rights reserved.
//
// Permission to use, copy, modify, and distribute this software for any
// purpose is hereby granted without fee, provided that this copyright and
// permissions notice appear in all copies and derivatives.
//
// This software is provided "as is" without express or implied warranty.

#ifndef REFLEX_BASE_H
#define REFLEX_BASE_H 1

// Include files
#include "Reflex/Kernel.h"
#include "Reflex/Type.h"

namespace Reflex {
// forward declarations

/**
 * @class Base Base.h Reflex/Base.h
 * @author Stefan Roiser
 * @date   2004-01-28
 * @ingroup Ref
 */
class RFLX_API Base {
   friend class Class;

public:
   /** default constructor */
   Base();


   /** constructor */
   Base(const Type &baseType,
        OffsetFunction offsetFP,
        unsigned int modifiers = 0);


   /** destructor */
   virtual ~Base() {}


   /**
    * the bool operator returns true if the type of the base is resolved (implemented)
    * @return true if base type is implemented
    */
   operator bool() const;


   /**
    * Name will return the string represenation of the base class
    * @param  typedefexp expand typedefs or not
    * @return string represenation of base class
    */
   std::string Name(unsigned int mod = 0) const;


   /**
    * IsPrivate will return true if the inheritance is private
    * @return true if inheritance is private
    */
   bool IsPrivate() const;


   /**
    * IsProtected will return true if the inheritance is protected
    * @return true if inheritance is protected
    */
   bool IsProtected() const;


   /**
    * IsPublic will return true if the inheritance is public
    * @return true if inheritance is public
    */
   bool IsPublic() const;


   /**
    * IsVirtual will return true if the inheritance is virtual
    * @return true if inheritance is virtual
    */
   bool IsVirtual() const;


   /**
    * Offset will return the Offset to the base class as int
    * @return Offset to base class
    */
   size_t Offset(void* mem = 0) const;


   /**
    * OffsetFP will return a pointer to the function which calculates the Offset
    * between the two classes
    * @return pointer to Offset calculating function
    */
   OffsetFunction OffsetFP() const;


   /**
    * ToType will return this base classes type
    * @param mod accepts FINAL to go to the final type for a typedef
    * @return type of base class
    */
   Type ToType() const;


   /**
    * ToScope will return this base classes scope
    * @return this base class as scope
    */
   Scope ToScope() const;

private:
   const Class* BaseClass() const;

private:
   /** function pointer to Stubfunction for Offset calculation */
   OffsetFunction fOffsetFP;


   /** modifiers of inheritance relation */
   unsigned int fModifiers;


   /**
    * pointer to base class
    * @label base bype
    * @link aggregation
    * @supplierCardinality 1
    * @clientCardinality 1
    */
   Type fBaseType;


   /**
    * back link to the class corresponding to the base
    * @label base class
    * @link aggregation
    * @clientCardinality 1
    * @supplierCardinality 0..1
    **/
   mutable
   const Class * fBaseClass;

};    // class Base
} // namespace Reflex


//-------------------------------------------------------------------------------
inline Reflex::Base::Base()
//-------------------------------------------------------------------------------
   : fOffsetFP(0),
   fModifiers(0),
   fBaseType(0, 0),
   fBaseClass(0) {
}


//-------------------------------------------------------------------------------
inline
Reflex::Base::operator bool() const {
//-------------------------------------------------------------------------------
   if (fBaseType) {
      return true;
   }
   return false;
}


//-------------------------------------------------------------------------------
inline bool
Reflex::Base::IsPrivate() const {
//-------------------------------------------------------------------------------
   return 0 != (fModifiers & PRIVATE);
}


//-------------------------------------------------------------------------------
inline bool
Reflex::Base::IsProtected() const {
//-------------------------------------------------------------------------------
   return 0 != (fModifiers & PROTECTED);
}


//-------------------------------------------------------------------------------
inline bool
Reflex::Base::IsPublic() const {
//-------------------------------------------------------------------------------
   return 0 != (fModifiers & PUBLIC);
}


//-------------------------------------------------------------------------------
inline bool
Reflex::Base::IsVirtual() const {
//-------------------------------------------------------------------------------
   return 0 != (fModifiers & VIRTUAL);
}


//-------------------------------------------------------------------------------
inline size_t
Reflex::Base::Offset(void* mem) const {
//-------------------------------------------------------------------------------
   return fOffsetFP(mem);
}


//-------------------------------------------------------------------------------
inline Reflex::OffsetFunction
Reflex::Base::OffsetFP() const {
//-------------------------------------------------------------------------------
   return fOffsetFP;
}


//-------------------------------------------------------------------------------
inline Reflex::Type
Reflex::Base::ToType() const {
//-------------------------------------------------------------------------------
   return fBaseType;
}


//-------------------------------------------------------------------------------
inline Reflex::Scope
Reflex::Base::ToScope() const {
//-------------------------------------------------------------------------------
// We are invoking "Type::operator Scope() const" here,
// be very careful with the cast (do not cast to a reference).
   return static_cast<const Scope>(fBaseType);
}


#endif // Reflex_Base