JStatic.hh

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#ifndef __JLANG_JSTATIC__
#define __JLANG_JSTATIC__
 
#include <istream>
#include <ostream>
 
#include "JLang/JClass.hh"
#include "JLang/JEquals.hh"
 
 
namespace JLANG {}
namespace JPP { using namespace JLANG; }
 
namespace JLANG {
 
  /**
   * Template data structure for static member declaration.
   */
  template<class T, int N>
  struct JStatic :
    public JEquals<JStatic<T, N>, T>
  {
 
    typedef typename JClass<T>::argument_type     argument_type;
 
 
    /**
     * Constructor.
     *
     * \param  value          value
     */
    JStatic(argument_type value)
    {
      this->value = value;
    }
    
 
    /**
     * Assignment operator
     *
     * \param  value          value
     * \return                this value
     */
    JStatic& operator=(argument_type value)
    {
      this->value = value;
 
      return *this;
    }
 
 
    /**
     * Type conversion operator.
     *
     * \return                value
     */
    operator const T& () const
    {
      return value;
    }
 
 
    /**
     * Type conversion operator.
     *
     * \return                value
     */
    operator T& ()
    {
      return value;
    }
 
 
    /**
     * Smart pointer.
     *
     * \return                value
     */
    const T* operator->() const
    {
      return &value;
    }
 
 
    /**
     * Smart pointer.
     *
     * \return                value
     */
    T* operator->()
    {
      return &value;
    }
 
 
    /**
     * Equals method.
     *
     * \param  object         object
     * \return                true if this object equals given object; else false
     */
    bool equals(const JStatic& object) const
    {
      return this->value == object.value;
    }
 
 
    /**
     * Equals method.
     *
     * \param  value          value
     * \return                true if this value equals given value; else false
     */
    bool equals(argument_type value) const
    {
      return this->value == value;
    }
 
 
    /**
     * Read static object from input stream.
     *
     * \param  in             input stream
     * \param  object         object
     * \return                input stream
     */
    friend inline std::istream& operator>>(std::istream& in, JStatic& object)
    {
      return in >> object.value;
    }
 
 
    /**
     * Write static object to output stream.
     *
     * \param  out            output stream
     * \param  object         object
     * \return                output stream
     */
    friend inline std::ostream& operator<<(std::ostream& out, const JStatic& object)
    {
      return out << object.value;
    }
 
  protected:
    static T value;
  };
 
 
  /**
   * Declaration of static data member.
   */
  template<class T, int N>
  T JStatic<T, N>::value;
 
 
  /**
   * Template specialisation of JStatic for static member declaration of pointer.
   */
  template<class T, int N>
  struct JStatic<T*, N> :
    public JEquals<JStatic<T*, N>, T*>
  {
 
    typedef typename JClass<T*>::argument_type    argument_type;
 
    /**
     * Assignment operator
     *
     * \param  value          value
     * \return                this value
     */
    JStatic& operator=(argument_type value)
    {
      this->value = value;
 
      return *this;
    }
 
 
    /**
     * Smart pointer.
     *
     * \return                value
     */
    const T* operator->() const
    {
      return value;
    }
 
 
    /**
     * Smart pointer.
     *
     * \return                value
     */
    T* operator->()
    {
      return value;
    }
 
 
    /**
     * Equals method.
     *
     * \param  object         object
     * \return                true if this object equals given object; else false
     */
    bool equals(const JStatic& object) const
    {
      return this->value == object.value;
    }
 
 
    /**
     * Equals method.
     *
     * \param  value          value
     * \return                true if this value equals given value; else false
     */
    bool equals(argument_type value) const
    {
      return this->value == value;
    }
 
  protected:
    static T* value;
  };
 
 
  /**
   * Declaration of static data member.
   */
  template<class T, int N>
  T* JStatic<T*, N>::value;
}
 
/**
 * Static data member declaration.
 *
 * \param  TYPE        data type
 */
#define  STATIC_DATA_MEMBER(TYPE)   static  JLANG::JStatic<TYPE, __COUNTER__>
 
#endif