JClonable.hh

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#ifndef __JLANG__JCLONABLE__
#define __JLANG__JCLONABLE__
 
#include "JLang/JNullType.hh"
 
/**
 * \author mdejong
 */
 
namespace JLANG {}
namespace JPP { using namespace JLANG; }
 
namespace JLANG {
 
 
  /**
   * Template class for object cloning.
   */
  template<class JClonable_t, class JDerived_t = JNullType>
  struct JClonable;
 
 
  /**
   * Template specialisation to define base class for interface of object cloning.
   */
  template<class JClonable_t>
  struct JClonable<JClonable_t, JNullType>
  {
    /**
     * Type definition of return value of method clone().
     */
    typedef JClonable_t*                                      clone_type;
 
 
    /**
     * Virtual destructor.
     */
    virtual ~JClonable() 
    {}
 
 
    /**
     * Get clone of this object.
     *
     * \return              pointer to newly created object
     */
    virtual clone_type clone() const = 0;
  };
 
 
  /**
   * Template specialisation to define base class for implementation of object cloning.
   *
   * This class derives from the specified clonable class and implements the method clone.
   */
  template<class JClonable_t, class JDerived_t>
  struct JClonable :
    public JClonable_t
  {
 
    typedef typename JClonable<JClonable_t>::clone_type       clone_type;
    
 
    /**
     * Get clone of this object.
     *
     * \return              pointer to newly created object
     */
    virtual clone_type clone() const override 
    {
      return new JDerived_t(static_cast<const JDerived_t&>(*this));
    }
  };
}
 
 
#endif