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  1. #include <iostream>
  2. #include <fstream>
  3. #include <string>
  4. #include <vector>
  5. #include <boost/lexical_cast.hpp>
  6. using namespace std;
  7.  
  8. struct Journal
  9. {
  10.   string title;
  11.   vector<string> entries;
  12.  
  13.   explicit Journal(const string& title)
  14.     : title{title}
  15.   {
  16.   }
  17.  
  18.   void add(const string& entry);
  19.  
  20.   // persistence is a separate concern
  21.   void save(const string& filename);
  22. };
  23.  
  24. void Journal::add(const string& entry)
  25. {
  26.   static int count = 1;
  27.   entries.push_back(boost::lexical_cast<string>(count++)
  28.     + ": " + entry);
  29. }
  30.  
  31. void Journal::save(const string& filename)
  32. {
  33.   ofstream ofs(filename);
  34.   for (auto& s : entries)
  35.     ofs << s << endl;
  36. }
  37.  
  38. struct PersistenceManager
  39. {
  40.   static void save(const Journal& j, const string& filename)
  41.   {
  42.     ofstream ofs(filename);
  43.     for (auto& s : j.entries)
  44.     {
  45.       ofs << s << endl;
  46.       std::cout << s << endl;
  47.     }
  48.   }
  49. };
  50.  
  51. int main()
  52. {
  53.   Journal journal{"Dear Diary"};
  54.   journal.add("I ate a bug");
  55.   journal.add("I cried today");
  56.  
  57.   //journal.save("diary.txt");
  58.  
  59.   PersistenceManager pm;
  60.   pm.save(journal, "diary.txt");
  61.  
  62.   return 0;
  63. }
Success #stdin #stdout 0.01s 5516KB
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1: I ate a bug
2: I cried today
https://ideone.com/vd1t2P
language:
C++14 (gcc 8.3)
created:
1 year ago
visibility:
public

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