JObjectAllocator.hh

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#ifndef __JLANG__JOBJECTALLOCATOR__
#define __JLANG__JOBJECTALLOCATOR__
 
#include <cstddef>
 
/**
 * \file
 * Auxiliary base class to speed up new/delete operations of any class.
 * \author mdejong
 */
namespace JLANG {}
namespace JPP { using namespace JLANG; }
 
namespace JLANG {
 
  /**
   * Base class for customized new/delete operators.
   * The first template argument refers to the data type for new/delete operations and
   * the second to the memory management class.
   *
   * Possible syntax:
   * <pre>
   * \#include "JLang/JRAM.hh"
   *
   *      class A : public JLANG::JObjectAllocator<A, JRAM> {
   *      };
   * </pre>
   * In this case, the new/delete operations are implemented by the JLANG::JRAM class.
   */
  template<class T, class JAllocator_t>
  class JObjectAllocator
  {
  protected:
    /**
     * Defaul constructor.
     */
    JObjectAllocator()
    {}
 
  public:
    /**
     * Get reference to unique instance of this class object.
     *
     * \return               reference to this class object
     */
    static inline JAllocator_t& getInstance()
    {
      static JAllocator_t allocator(BLOCK_SIZE);
 
      return allocator;
    }
    
 
    static const std::size_t BLOCK_SIZE = sizeof(T);    //!< size of object [Byte]
 
 
    /**
     * new operator.
     *
     * \return                     pointer to new object (or NULL)
     */
    static inline void* operator new(const std::size_t size)
    {
      return getInstance().allocate();
    }
 
    
    /**
     * delete operator.
     *
     * \param  p                   pointer to object to be freed
     * \param  size                number of bytes
     */
    static inline void operator delete(void* p, const std::size_t size)
    {
      getInstance().free(p);
    }
  };
}
 
#endif