JObject.hh

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#ifndef __JLANG__JOBJECT__
#define __JLANG__JOBJECT__

/**
 * \author mdejong
 */

namespace JLANG {}
namespace JPP { using namespace JLANG; }

namespace JLANG {

  
  /**
   * Auxiliary base class for inline creation of a static value or clone from a temporary object.
   */
  template<class T>
  struct JObject {

    typedef T  data_type;

    /**
     * Get static instance from temporary object.
     *
     * \return              reference to static object
     */
    data_type& getInstance() 
    {
      static char buffer[sizeof(T)];

      new (buffer) T(static_cast<const T&>(*this));

      T* p = reinterpret_cast<data_type*>(buffer);

      return *p;
    }


    /**
     * Get clone from temporary object.
     *
     * \return              pointer to newly created object
     */
    data_type* clone() const 
    {
      return new T(static_cast<const T&>(*this));
    }

  protected:
    /**
     * Default constructor.
     */
    JObject()
    {}


    /**
     * Copy constructor.
     */
    JObject(const JObject&)
    {}

  private:
    JObject& operator=(const JObject&);
  };


  /**
   * Get static instance from temporary object.
   *
   * \param  object       object
   * \return              reference to static object
   */
  template<class T>
  inline T& getInstance(const T& object) 
  {
    static char buffer[sizeof(T)];

    new (buffer) T(object);

    T* p = reinterpret_cast<T*>(buffer);
    
    return *p;
  }
}

#endif