(C++) Question

 

Question is a class for a question.

Technical facts

 

 

 

 

 

 

./CppQuestion/CppQuestion.pri

 

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INCLUDEPATH += \     ../../Classes/CppQuestion SOURCES += \     ../../Classes/CppQuestion/question.cpp HEADERS  += \     ../../Classes/CppQuestion/question.h OTHER_FILES += \     ../../Classes/CppQuestion/Licence.txt

 

 

 

 

 

./CppQuestion/question.h

 

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//--------------------------------------------------------------------------- /* Question, class for a question Copyright 2011-2015 Richel 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 <string> #include <vector> #include <boost/checked_delete.hpp> namespace ribi { ///Class for a question. ///A question only knows its question and correct answers and optionally ///an image. Derived classes need to maintain incorrect answers. struct Question {   explicit Question(     const std::string& filename,     const std::string& question,     const std::vector<std::string>& correct_answers   );   ///Create a copy of the Question, depending on the derived class its type   virtual Question * Clone() const noexcept = 0;   ///Obtain the correct answer(s)   const std::vector<std::string>& GetCorrectAnswers() const noexcept { return m_correct_answers; }   ///Obtain the possible media filename, which will be empty   ///if none is used   const std::string& GetFilename() const noexcept { return m_filename; }   ///Obtain the question   const std::string& GetQuestion() const noexcept { return m_question; }   ///Obtain the version   static std::string GetVersion() noexcept;   ///Obtain the version history   static std::vector<std::string> GetVersionHistory() noexcept;   ///Would a submitted std::string be the correct answer?   bool IsCorrect(const std::string& s) const noexcept;   ///How to display the question as multiple lines   virtual std::vector<std::string> ToLines() const noexcept = 0;   ///Convert to std::string line, as read from file   virtual std::string ToStr() const noexcept = 0;   protected:   virtual ~Question() noexcept {}   private:   friend void boost::checked_delete<>(Question *);   friend void boost::checked_delete<>(const Question *);   ///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_correct_answers; }; std::ostream& operator<<(std::ostream& os,const Question& question); } //~namespace ribi #endif // QUESTION_H

 

 

 

 

 

./CppQuestion/question.cpp

 

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//--------------------------------------------------------------------------- /* Question, class for a question Copyright 2011-2015 Richel 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 "question.h" #include <algorithm> #include <cassert> #include <fstream> #include <iterator> #include <string> #include <stdexcept> ribi::Question::Question(     const std::string& filename,     const std::string& question,     const std::vector<std::string>& correct_answers ) : m_filename(filename),   m_question(question),   m_correct_answers(correct_answers) {   if (m_question.empty())   {     throw std::logic_error("A Question must contain a question");   }   if (m_correct_answers.empty())   {     throw std::logic_error("A question must have at least one answer");   } } std::string ribi::Question::GetVersion() noexcept {   return "1.1"; } std::vector<std::string> ribi::Question::GetVersionHistory() noexcept {   return {     "2011-06-27: version 1.0: initial version",     "2011-09-16: version 1.1: contructor throws error when input is invalid"   }; } bool ribi::Question::IsCorrect(const std::string& s) const noexcept {   return std::find(m_correct_answers.begin(),m_correct_answers.end(),s) != m_correct_answers.end(); } std::ostream& ribi::operator<<(std::ostream& os,const Question& question) {   const std::vector<std::string> v = question.ToLines();   std::copy(v.begin(),v.end(),std::ostream_iterator<std::string>(os,"\n"));   return os; }