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, class JParent_t = void, int N = 0>
  struct JStatic :
    public JEquals<JStatic<T, JParent_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;
    }

  private:
    static T value;
  };


  /**
   * Declaration of static data member.
   */
  template<class T, class JParent_t, int N>
  T JStatic<T, JParent_t, N>::value;


  /**
   * Template specialisation of JStatic for static member declaration of pointer.
   */
  template<class T, class JParent_t, int N>
  struct JStatic<T*, JParent_t, N> :
    public JEquals<JStatic<T*, JParent_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;
    }

  private:
    static T* value;
  };


  /**
   * Declaration of static data member.
   */
  template<class T, class JParent_t, int N>
  T* JStatic<T*, JParent_t, N>::value;
}

#endif