xalloc.hh

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#ifndef MISC_XALLOC_HH
# define MISC_XALLOC_HH

# include <iostream>
# include <functional>

namespace misc
{
  struct iomanipulator : public std::unary_function<void, std::ostream>
  {
    virtual ~iomanipulator();
    virtual void operator()(std::ostream& o) const = 0;
  };

  std::ostream& operator<<(std::ostream& o, const iomanipulator& g);


  template <class StoredType>
  class xalloc
  {
  private:
    class set_type : public iomanipulator
    {
    public:
      set_type(const xalloc& slot, StoredType& data);
      void operator()(std::ostream& ostr) const override;
    private:
      const xalloc& slot_;
      StoredType& data_;
    };

    class get_type : public iomanipulator
    {
    public:
      get_type(const xalloc& slot, StoredType& data);

      void operator()(std::ostream& ostr) const override;
    private:
      const xalloc& slot_;
      StoredType& data_;
    };

    class swap_type : public iomanipulator
    {
    public:
      swap_type(const xalloc& slot, StoredType& data);

      void operator()(std::ostream& ostr) const override;
    private:
      const xalloc& slot_;
      StoredType& data_;
    };

    const long int index_;

  public:
    xalloc();
    long int index() const;
    StoredType& operator()(std::ostream& ostr) const;

    set_type set(StoredType& data) const;

    get_type get(StoredType& data) const;

    swap_type swap(StoredType& data) const;
  };

}

# include <misc/xalloc.hxx>

#endif // !MISC_XALLOC_HH