xalloc.hh

Go to the documentation of this file.

#pragma once

#include <iostream>
#include <functional>

#include <vcsn/misc/attributes.hh>

namespace vcsn
{
  struct iomanipulator
  {
    virtual void operator()(std::ostream& o) const = 0;
  };

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


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

    const long int index_;

  public:
    xalloc();
    long int index() const ATTRIBUTE_PURE;
    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 <vcsn/misc/xalloc.hxx>