Finalizable.h

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// this is for emacs file handling -*- mode: c++; indent-tabs-mode: nil -*-

// -- BEGIN LICENSE BLOCK ----------------------------------------------
// This file is part of FZIs ic_workspace.
//
// This program is free software licensed under the LGPL
// (GNU LESSER GENERAL PUBLIC LICENSE Version 3).
// You can find a copy of this license in LICENSE folder in the top
// directory of the source code.
//
// © Copyright 2016 FZI Forschungszentrum Informatik, Karlsruhe, Germany
//
// -- END LICENSE BLOCK ------------------------------------------------

//----------------------------------------------------------------------
//----------------------------------------------------------------------
#ifndef ICL_CORE_FINALIZABLE_H_INCLUDED
#define ICL_CORE_FINALIZABLE_H_INCLUDED

#include <iostream>
#include <stdexcept>

namespace icl_core {

template <typename T>
class Finalizable
{
public:
  Finalizable(const T& value)
    : m_value(value),
      m_final(false)
  { }

  Finalizable(const Finalizable& other)
    : m_value(other.m_value),
      m_final(other.m_final)
  { }

  Finalizable& operator = (const Finalizable& other)
  {
    if (!m_final)
    {
      m_value = other.m_value;
      return *this;
    }
    else
    {
      throw std::logic_error("object is final");
    }
  }

  Finalizable& operator = (const T& value)
  {
    if (!m_final)
    {
      m_value = value;
      return *this;
    }
    else
    {
      throw std::logic_error("object is final");
    }
  }

  operator T () const { return m_value; }

  bool isFinal() const { return m_final; }

  void finalize() { m_final = true; }

  std::ostream& operator << (std::ostream& os)
  {
    return os << m_value;
  }

private:
  T m_value;
  bool m_final;
};

}

#endif