ExpectedType.h

Go to the documentation of this file.

// 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_EXPECTED_TYPE_H_INCLUDED
#define ICL_CORE_EXPECTED_TYPE_H_INCLUDED

#include <boost/shared_ptr.hpp>

namespace icl_core {

template <typename T> struct ExpectedTypeIs;

struct ExpectedType
{
public:
  typedef boost::shared_ptr<const ExpectedType> Ptr;

  virtual ~ExpectedType() { }

  template <typename T> bool is() const { return ExpectedTypeIs<T>().equals(this); }

  bool operator == (const ExpectedType& other) const
  {
    return this->equals(&other);
  }

  bool operator != (const ExpectedType& other) const
  {
    return !this->equals(&other);
  }

protected:
  virtual bool equals(const ExpectedType *other) const = 0;
};

template <typename T>
struct ExpectedTypeIs : public ExpectedType
{
protected:
  bool equals(const ExpectedType *other) const
  {
    return dynamic_cast<const ExpectedTypeIs<T> *>(other) != NULL;
  }
  friend struct ExpectedType;
};

}

#endif