Question is a class for a question.

question.h


//---------------------------------------------------------------------------

/*

Question, class for a question

Copyright (C) 2011  Richl Bilderbeek



This program is free software: you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation, either version 3 of the License, or

(at your option) any later version.



This program is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

GNU General Public License for more details.



You should have received a copy of the GNU General Public License

along with this program.  If not, see <http://www.gnu.org/licenses/>.

*/

//---------------------------------------------------------------------------

// From http://www.richelbilderbeek.nl/CppQuestion

//---------------------------------------------------------------------------

#ifndef QUESTION_H

#define QUESTION_H

//---------------------------------------------------------------------------

#include <vector>

#include <string>

#include <boost/checked_delete.hpp>

//---------------------------------------------------------------------------

///Class for a question

struct Question

{

  ///Create a copy of the Question, depending on the derived class its type

  virtual Question * Clone() const = 0;



  ///Is the submitted std::string a correct answer?

  bool IsCorrect(const std::string& s) const;



  ///Obtain the possible media filename, which will be empty

  ///if none is used

  const std::string& GetFilename() const { return m_filename; }



  ///Obtain the question

  const std::string& GetQuestion() const { return m_question; }



  ///Obtain the version

  static const std::string GetVersion();



  ///Obtain the version history

  static const std::vector<std::string> GetVersionHistory();



  protected:

  //Made constructor private, because one cannot make a Question, only

  //derived classes of Question

  Question(

    const std::string& filename,

    const std::string& question,

    const std::vector<std::string>& answers);



  virtual ~Question() {}

  friend void boost::checked_delete<>(Question *);



  ///Obtain the answer(s)

  const std::vector<std::string>& GetAnswers() const { return m_answers; }



  ///Every Question might have a media filename

  const std::string m_filename;



  ///The question

  const std::string m_question;



  ///The list of possible answers

  const std::vector<std::string> m_answers;

};

//---------------------------------------------------------------------------

#endif // QUESTION_H

question.cpp


//---------------------------------------------------------------------------

/*

Question, class for a question

Copyright (C) 2011  Richl Bilderbeek



This program is free software: you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation, either version 3 of the License, or

(at your option) any later version.



This program is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

GNU General Public License for more details.



You should have received a copy of the GNU General Public License

along with this program.  If not, see <http://www.gnu.org/licenses/>.

*/

//---------------------------------------------------------------------------

// From http://www.richelbilderbeek.nl/CppQuestion

//---------------------------------------------------------------------------

#include <algorithm>

#include <cassert>

#include <fstream>

#include <string>

#include <stdexcept>

//---------------------------------------------------------------------------

#include "question.h"

//---------------------------------------------------------------------------

Question::Question(

    const std::string& filename,

    const std::string& question,

    const std::vector<std::string>& answers)

: m_filename(filename),

  m_question(question),

  m_answers(answers)

{

  if (m_question.empty()) throw std::logic_error("Question must not be empty");

  if (m_answers.empty()) throw std::logic_error("Answers must not be empty");

}

//---------------------------------------------------------------------------

const std::string Question::GetVersion()

{

  return "1.1";

}

//---------------------------------------------------------------------------

const std::vector<std::string> Question::GetVersionHistory()

{

  std::vector<std::string> v;

  v.push_back("2011-06-27: version 1.0: initial version");

  v.push_back("2011-09-16: version 1.1: contructor throws error when input is invalid");

  return v;

}

//---------------------------------------------------------------------------

bool Question::IsCorrect(const std::string& s) const

{

  return std::find(m_answers.begin(),m_answers.end(),s) != m_answers.end();

}

//---------------------------------------------------------------------------

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(C++) Question

question.h

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